您之前可能听说过VPN，并且您也可能使用过它。VPN(A VPN)代表虚拟专用网络(Virtual Private Network)，这基本上意味着它为您提供在线隐私。最初，只有大型企业和政府机构使用VPN服务，但如今，许多互联网用户使用VPN服务来保护他们的数据。如今(Nowadays)，每个人都使用VPN，因为它可以确保您的位置保持私密；数据被加密，而您可以匿名上网。
今天，在技术不断发展的世界中，没有不依赖互联网(Internet)的工作。如今，互联网(Internet)不仅是我们生活的一部分，事实上，它也是我们的生活。没有互联网，我们觉得什么都不存在。但是随着互联网的技术和使用日益增长，它也提出了安全问题。当我们使用手机和笔记本电脑进行在线支付时，我们会使用社交媒体将我们的个人详细信息发送给其他人。因此(Hence)，我们所有的手机和笔记本电脑都包含非常敏感和私密的信息，显然需要加以保护和保护。
我们经常使用互联网(Internet)，但不知道它是如何工作的。那么，让我们先看看互联网(Internet)是如何传输和接收数据的。
互联网如何运作(How Internet Works)
如今，您可以通过多种方式访问 Internet。与手机一样，您可以使用移动数据或任何WiFi连接。在笔记本电脑或 PC 中，您可以使用WiFi或通道电缆。您可能有一些调制解调器/路由器，您的桌面通过以太网(Ethernet)连接，您的笔记本电脑和手机通过WiFi连接。在连接到移动数据或调制解调器或WiFi之前，您处于本地网络，但一旦您连接到其中任何一个，您就处于一个称为Internet的庞大网络中。
每当您在Internet上执行某些操作（例如搜索网页）时，它首先会从您的本地网络到达您正在使用的电话公司或公司的WiFi 。从那里它走向广阔的网络“互联网(Internet)”并最终到达网络服务器。在网络服务器上，它会查找您请求的网页并将所请求的网页发送回互联网上，然后到达电话公司并最终通过调制解调器或移动数据或WiFi（无论您使用什么来访问互联网），最后到达您的电脑或手机。
在将您的请求发送到 Internet 之前，会附加一个称为 IP 地址的地址，以便当请求的网页到达时，它应该知道请求从哪里发送以及它必须到达哪里。现在我们的请求通过本地网络、电话公司或调制解调器、互联网，最后到达网络服务器。因此(Hence)，我们的 IP 地址在所有这些地方都是可见的，并且通过 IP 地址，任何人都可以访问我们的位置。由于流量过大，该网页还会记录您的 IP 地址，并暂时将其记录在那里一段时间，这引发了隐私问题。它可能会阻碍您的私人数据，并可以查看您在系统上所做的事情。
最大的隐私问题出现在开放式WiFi上。假设(Suppose)您在一家提供免费开放WiFi的餐厅。作为一个绝望的互联网用户，您将立即连接到它并开始尽可能多地使用它，而不知道这些免费WiFi中的大多数都是完全开放的，没有任何加密。免费WiFi(WiFi)提供商很容易查看您的私人数据和您在做什么。最糟糕的是，其他人连接同一个WiFi也很容易(WiFi)热点捕获通过该网络发送的所有数据包（数据或信息）。它使他们很容易提取有关您正在访问的密码和网站的所有信息。因此，始终建议您不要使用公共开放WiFi访问您的敏感信息，例如银行详细信息、在线支付等。
在访问某些站点时，会出现一个问题，即该内容或站点被阻止，您无法访问它。这可能是出于教育原因或政治原因或任何其他原因。例如，大学(Universities)为每个学生提供登录凭据，以便他们可以访问大学WiFi。但是一些大学认为不适合学生的网站（如种子等）将它们屏蔽了，因此学生无法使用大学WiFi访问它们。
因此，为了解决所有这些问题，VPN应运而生。
什么是VPN？？(What is a VPN ??)
VPN代表虚拟专用网络(Virtual Private Network)。它通过安全性较低的网络（例如公共互联网(Internet)）创建与其他网络的安全、可靠和加密的连接。它为您的本地网络提供了一道屏障，因此您所做的任何事情（例如浏览网站、访问敏感信息等）都不会被其他网络看到。它还可用于访问受限站点等。
最初，创建VPN(VPNs)是为了连接业务网络并为企业员工提供廉价、安全的企业数据访问。如今(Nowadays)，VPN(VPNs)变得非常流行。学生、员工、自由职业者和商务旅行者（在不同国家旅行）等大量人员使用它们来访问受限制的站点。VPN有多种用途：
- 通过提供安全性来防止私人和敏感数据泄露
- 帮助(Helps)访问被阻止和受限制的站点
- 防止在流量大时被 Web 服务器记录
- 有助于隐藏真实位置
VPN的类型(Types of VPN)
VPN有几种类型：
远程访问： (Remote Access: )远程访问 VPN允许个人用户通过使用连接到(Access VPN)Internet的计算机或笔记本电脑提供远程位置作为远程位置来连接到专用业务网络。
站点到站点： (Site-to-site: )站点(Site)到站点 VPN(Site VPN)允许位于固定位置的多个办公室通过公共网络（例如Internet ）进行连接。
移动： (Mobile: )移动 VPN(Mobile VPN)是一种网络，其中移动设备在从一个位置移动到另一个位置时访问虚拟专用网络(Virtual Private Network)( VPN ) 或内部网。(VPN)
硬件： (Hardware: )硬件 VPN(Hardware VPN)是一个独立的设备。硬件 VPN(Hardware VPNs)以与硬件路由器为家庭和小型企业计算机提供相同的方式提供增强的安全性。
VPN不仅仅从Android使用。您可以从 windows、Linux、Unix等使用(Unix)VPN。
VPN如何工作？(How Does VPN work?)
如果您的设备中有VPN提供商来使用VPN ，这将有所帮助，无论是手机、笔记本电脑还是台式机。根据服务提供商的不同，您可以手动设置VPN或通过任何程序/应用程序使用它。关于VPN应用程序，有多种选择。您可以使用任何VPN应用程序。在您的设备中设置VPN后，您就可以使用它了。(VPN)
现在在使用Internet之前，请连接您的VPN。您的设备现在将与您选择的国家/地区的VPN服务器建立加密连接。现在您的计算机或手机将与VPN在同一本地网络上运行。
所有数据在到达电话公司或WiFi提供商之前都经过加密。现在，无论您使用互联网做什么，在到达电话公司、调制解调器或WiFi提供商之前，您的所有网络流量都会以加密数据的形式到达安全的VPN网络。(VPN)现在它将到达电话公司或调制解调器或WiFi，然后最终到达网络服务器。在查找 IP 地址时，网络服务器获取 VPN的 IP 地址，而不是发出请求的 IP 地址。通过这种方式，VPN 有助于隐藏您的位置(In this way, VPN helps in hiding your location)。当数据回来时，它首先通过电话公司或WiFi到达(WiFi)VPN或调制解调器，然后通过安全和加密的VPN连接与我们联系。
由于目标站点将VPN服务器视为来源而不是您的，如果有人想查看您发送的数据，他们只能看到加密数据而不是原始数据，因此VPN 可以防止私人数据泄露(that VPN protects from leaking of private data)。
目标站点只能看到VPN服务器的 IP 地址，而不是您的。因此，如果您想访问某些被阻止的站点，您可以选择VPN服务器 IP 地址，因为它来自其他地方，这样当 Web 服务器查找请求来源的 IP 地址时，它不会找到 IP 地址块并且可以轻松发送请求的数据。例如：如果您在其他国家/地区并想访问某些印度(India)网站，例如Netflix，该网站在其他国家/地区被阻止。所以你可以选择你的VPN服务器国家，比如印度(India)，这样当Netflix服务器查找请求的 IP 地址时，它会找到印度(India)并轻松发送所请求的数据。通过这种方式，VPN 有助于访问被阻止和受限制的站点(In this way, VPN helps in accessing blocked and restricted sites)。
使用VPN(VPN)还有一个好处。一些在线网站的价格会根据您所在的位置而有所不同。示例：如果您在印度(India)，则某样东西的价格不同，如果您在美国(USA)，则相同的东西不同。因此，将VPN连接到价格低廉的国家有助于以低价购买产品并节省资金。
因此，始终建议在连接公共WiFi之前先连接(WiFi)VPN，或者如果您想访问被阻止的站点或进行在线购物或任何预订。
VPN 如何访问被阻止的网站(How a VPN gets access to the blocked websites)
网站被我们的互联网服务提供商(Internet Service Providers)( ISP ) 或网络管理员阻止。当用户想要访问ISP阻止的网站时， ISP不允许将请求转发到托管该网站的服务器。那么VPN如何通过它。
VPN连接到虚拟专用服务器(Private Server)( VPS )，因此当用户请求网站时，我们所连接的ISP或路由器认为我们正在请求连接到未被阻止的VPS 。由于这是一个恶作剧，ISP允许我们访问这些VPS并连接到它们。这些VPS向托管这些网站的服务器发送请求，然后这些VPS返回用户的数据。通过这种方式，VPN可以访问任何网站。
免费 VPN 与付费 VPN(Free VPN vs Paid VPN)
如果您打算使用免费的VPN，您可以期望您的隐私将得到一定程度的维护，但会做出一些妥协。他们可能将您的信息出售给第三方或反复展示令人讨厌和不必要的广告；此外，他们正在记录您的活动。此外，一些不可靠的VPN应用程序正在使用这些信息来侵入用户隐私。
建议购买VPN的付费版本，因为它们的成本不是很高，而且它们将为您提供比免费版本更多的隐私。此外，使用免费VPN时，您将可以访问公共或使用过的服务器，如果您使用付费的VPN服务，您将获得自己的服务器，这将带来良好的速度。一些付费最高的VPN是Express VPN、Nord VPN、Hotspot Shield等等。要查看一些惊人的付费VPN以及它们的月度和年度订阅率，请查看这篇文章。(check out this article.)
使用 VPN 的缺点(Disadvantages of Using a VPN)
- 使用VPN时，速度是一个大问题。
- VPS的参与增加了获取网页的过程长度，从而降低了速度。
- VPN连接可能会意外断开，您可能会在不知情的情况下继续使用互联网。
- 在某些国家/地区使用VPN是非法的，因为它们提供匿名、隐私和加密。
- 一些在线服务可以检测到VPN的存在，它们会阻止VPN用户。
VPN非常适合为任何有兴趣非法查看您的数据的人提供隐私和数据加密。人们可以使用它们来解锁网站并维护隐私。但是，并不是每次都需要VPN 。如果您连接到公共WiFi，建议使用VPN来保护您的信息不被黑客入侵。
受到推崇的：(Recommended:)
我希望这篇文章对您有所帮助，并且您会得到这个问题的答案：什么是 VPN 以及它是如何工作的？(What is a VPN and how it works?)如果您对本指南仍有任何疑问，请随时在评论部分提出。
What is a VPN and how it works?
You have probably heаrd of a VPN before, and you have likely used it also. A VPN stаnds for Virtual Private Network, which basically means it gives you privаcy оnline. Originally, only bіg buѕіnesses and government organizations used VPN services, but nowadays, many internet uѕers use VPN services to secure their data. Nowаdays, everyone uses a VPN since it ensures that your location stays privatе; the data is encryptеd while уou can surf the internet anonymously.
Today in the world of growing technology, there is no work for which we are not dependent on the Internet. Internet is not only a part of our life these days, in fact, but it is also our life. Without the internet, we feel like nothing exists. But as technology and use of the internet are growing tremendously day by day, it also raises Security’s question. As we do online payments using phones and laptops, we send our personal details to others using social media. Hence, all our phones and laptops contain very sensitive and private information that obviously needs to be protected and secured.
We use the Internet a lot but do not know how does it work. So, let’s look at first how the Internet actually transfers and receive data.
How Internet Works
These days you can access the Internet in several ways. Like in phones, you can use mobile data or any WiFi connection. In laptops or PCs you can use WiFi or lane cables. You may have some modem/router to which your desktop is connected via Ethernet and your laptops and phones through WiFi. Before connecting to the mobile data or modem or WiFi, you are at your local network, but as soon as you connect to any of them, you are at a vast network called the Internet.
Whenever you do something on the Internet like searching for a web page, it first reaches from your local network to phone company or company’s WiFi you are using. From there it heads towards vast network ‘Internet’ and eventually arrives at the webserver. At web server it looks for the web page you have requested and send back the requested web page which flies over the internet and arrives at the phone company and eventually makes it way through modem or mobile data or WiFi (whatever you are using to access the internet) and finally reaches at your computer or phones.
Before sending your request to internet, an address called IP address is attached to it so that when requested web page arrives it should know from where the request was sent and where it has to reach. Now the request we have made travel through the local network, phone company or modem, internet and then finally at the webserver. Hence, our IP address is visible at all these places, and through IP address, anyone can access our location. The web page will also log your IP address due to heavy traffic and temporarily for some time it will be logged there, and here it raises the question of privacy. It can hinder your private data and can look at what you are doing on your systems.
The biggest privacy problem arises with open WiFi. Suppose you are at some restaurant which offers free and open WiFi. Being a desperate internet user, you will immediately connect to it and start using it as much as possible without knowing that most of these free WiFi’s are completely open without any encryption. It is very easy for free WiFi provider to look into your private data and what you are doing. The worst thing is it is also easy for other people connected with the same WiFi hotspot to capture all packets (data or information) send over this network. It makes it very easy for them to pull out all the information regarding your passwords and websites you are accessing. So it is always advised you should not access your sensitive information like banking details, online payments etc. using public open WiFi.
While accessing some sites, one problem arises about that content or site is blocked, and you cannot access it. It can be for an educational reason or political reason or any other reason. For example, Universities provide each student login credentials so that they can access college WiFi. But some sites ( like torrent etc. ), which universities find are not suitable for students, blocked them so that students cannot access them using college WiFi.
So, to solve all these problems, VPN comes into the role.
What is a VPN ??
VPN stands for Virtual Private Network. It creates a safe, secure and encrypted connection to other networks over the less-secure network such as the public Internet. It provides a shield to your local network so that whatever you are doing like browsing websites, accessing sensitive information, etc., will not be visible to other networks. It can also be used to access restricted sites and more.
Initially, VPNs were created to connect business networks and provide business employees inexpensive, safe access to corporate data. Nowadays, VPNs have become very popular. They are used by a large number of people like students, employees, freelancers, and business travellers (who travel in different countries) to access the restricted sites. VPN serves many purposes:
- Protect from leaking of private and sensitive data by providing security
- Helps in accessing blocked and restricted sites
- Protect from being logged by a web server during heavy traffic
- Helps in hiding the true location
Types of VPN
There are several types of VPN:
Remote Access: A Remote Access VPN allows an individual user to connect to a private business network by providing location as a remote location using a computer or laptop connected to the Internet.
Site-to-site: Site to Site VPN allows multiple offices at a fixed location to connect over a public network such as the Internet.
Mobile: Mobile VPN is a network in which mobile devices access a Virtual Private Network (VPN) or intranet while moving from one location to another.
Hardware: Hardware VPN is a single, stand-alone device. Hardware VPNs provide enhanced security in the same way as hardware routers provide for home and small-business computers.
VPNs are not used only from Android. You can use VPN from windows, Linux, Unix and so on.
How Does VPN work?
It would help if you had a VPN provider in your device to use VPN, whether it is a mobile phone or laptop or desktop. Depending on the service provider, you can either set up the VPN manually or use it through any programme/app. Regarding VPN app, there are several choices out there. You can use any VPN app. Once the VPN is set up in your device, you are all set to use it.
Now before using the Internet, connect your VPN. Your device will now make an encrypted connection to the VPN server in the country you will choose. Now your computer or mobile phone will act on the same local network as a VPN.
All the data is encrypted before it reaches to phone company or WiFi provider. Now whatever you do use the internet, all your network traffic before reaching the phone company or modem or WiFi provider reaches a secure VPN network as encrypted data. Now it will arrive at the phone company or modem or WiFi and then finally at the webserver. When looking for an IP address, the webserver gets the IP address of VPN instead of the IP address from where the request was made. In this way, VPN helps in hiding your location. When data comes back, it first reached VPN through phone company or WiFi or modem and then reached to us through a secured and encrypted connection of VPN.
As destination site sees VPN server as the origin and not yours and if someone wants to see what data you are sending, they can only see the encrypted data and not the raw data so that VPN protects from leaking of private data.
The destination site sees the IP address of VPN server only and not yours. So if you want to access some blocked site, you can choose VPN server IP address as it is from somewhere else so that when web server looks for IP address of from where the request is originated, it will not find the IP address block and can easily send the requested data. For example: If you are in a different country and want to access some Indian site like Netflix, which is blocked in other countries. So you can choose your VPN server country like India so that when the Netflix server looks for IP address from where the request originated, it will find the IP address of India and easily send the requested data. In this way, VPN helps in accessing blocked and restricted sites.
There is one more benefit of using a VPN. Some online sites prices vary according to your location. Example: if you are in India, the price of something is different, and if you are in the USA, the same thing is different. So connecting VPN to a country where prices are low helps buy the product at low prices and saves money.
So, it is always advisable to connect to VPN before connecting to public WiFi, or if you want to access blocked sites or do online shopping or any booking.
How a VPN gets access to the blocked websites
Websites are blocked by our Internet Service Providers (ISP’s) or by the network administrators. When a user wants to access a website that the ISP blocks, the ISP does not allow the request to move forward to the server hosting that website. So how a VPN gets through it.
A VPN connects to a Virtual Private Server (VPS), so when the user is requesting a website, the ISP or the router to which we are connected to think that we are requesting to be connected to the VPS which is not blocked. As this is a spoof, the ISP’s allow us access to these VPS and connect to them. These VPS send a request to the server that are hosting these websites, and then these VPS returns the user’s data. In this way, VPN’s get access to any website.
Free VPN vs Paid VPN
If you are going to use a free VPN, you can expect that your privacy will be maintained up to some level, but some compromises will be made. They may be selling your information to a third party or showing irritating and unnecessary ads repeatedly; also, they are logging your activity. Moreover, some unreliable VPN apps are using the information to hack into user privacy.
It is advised to go for paid versions of VPN’s as they are not very costly plus they will provide you with a lot more privacy than the free version would. Also, when using a free VPN, you will get access to a public or used server, and if you go for a VPN service that is paid, you will get a server for yourself, which will lead to a good speed. Some of the best paid VPN’s are Express VPN, Nord VPN, Hotspot Shield and many more. To check out some amazing paid VPN’s and about their monthly and yearly subscription rate, check out this article.
Disadvantages of Using a VPN
- The speed is a big issue when using a VPN.
- The involvement of VPS increases the process length of fetching a webpage and thus decreases the speed.
- VPN connections can drop unexpectedly, and you might keep using the internet without knowing about this.
- The use of VPN is illegal in some countries as they provide anonymity, privacy, and encryption.
- Some online services can detect the presence of a VPN, and they block the VPN users.
VPN’s are great for providing privacy and encryption of your data from anyone interested in viewing your data illegally. One can use them to unblock sites and maintain privacy. However, VPN’s are not needed every time. If you are connected to a public WiFi, it is recommended to use a VPN to protect your information from getting hacked.
Recommended:
I hope this article was helpful, and you get an answer to this question: What is a VPN and how it works? If you still have any questions regarding this guide, please feel free to ask them in the comment’s section.
