How does a VPN work and why you might need it?

Anonymous VPN
Anonymous VPN

Imagine being able to browse the internet without ever worrying about being hacked or spied on. Imagine being able to access exclusive content on websites that are not normally available in your country. All this is possible thanks to a simple and accessible technology: the VPN.

In this article, you'll learn how a VPN can protect your privacy online and allow you to access all the content you want, wherever you are in the world.

Definition of a VPN: Simple and Concise Explanation

A VPN, also known as a Virtual Private Network, is an online security tool that helps create a secure connection between your machine and a remote server. This connection encrypts the data exchanged between you and the VPN server.

Additionally, a VPN hides your IP address, which means you can browse the Internet more anonymously. It also lets you access geo-restricted websites and bypass online censorship restrictions.

In short, a VPN is an online security tool that helps protect your data while browsing the Internet, while providing freer access to the Internet.

How does a VPN work?

First of all, you should know that the main feature of a VPN is that it allows encrypted communication. Indeed, the data you send and receive is masked to prevent any interception or espionage.

Here are the main steps in how a VPN works:

  • VPN Software Launch : To use a VPN, you must first install VPN software on your device. Once the software is launched, you can connect to a VPN server located in another country or region.
  • Connection to VPN server : Once the VPN software is launched, you can connect to a remote VPN server by choosing a location. The software then establishes an encrypted connection between your device and the VPN server.
  • Data encryption : All data you send or receive over the Internet is encrypted using a security protocol, such as SSL or TLS. This means that no one can intercept your data or spy on your online activity.
  • Hiding your IP address : When you are connected to a VPN server, your real IP address is hidden and replaced by the IP address of the VPN server. This means that your online activity cannot be easily tracked or monitored by third parties.

A web request without VPN

When you enter a web address such as without using a VPN, your computer will connect directly to the corresponding server and send a request to access the index.php page.


After a normal Internet connection, this is what happens:

  • The websites you visit have access to your real IP address as well as your precise geolocation.
  • Your internet service provider may monitor the sites you visit, the emails you send, the downloads you make, etc.
  • If your WiFi line is not secure, a hacker can intercept the data you send and receive.

A web request with VPN

When using a VPN, the connection process is slightly different. When you enter the address, your computer will first connect to the VPN server, which will then send a request to retrieve the index.php page from the server

This means that the VPN server acts as an intermediary between your computer and the destination server, which hides your real IP address and protects your privacy online.


Here's what happens when using a VPN:

  • The curious can only see the IP address of the VPN server and its geolocation.
  • All data exchanged with the Internet is encrypted, which prevents your Internet service provider from seeing the content of your data.
  • Hackers cannot access your data because it is encrypted.

Difference between a VPN and a proxy

Un proxy allows you to hide your IP address by providing you with a new IP address and bypass location restrictions. However, it does not encrypt your communications. Indeed, these remain open and can be intercepted and read by third parties.

In contrast, a VPN relies on a tunneling protocol that encrypts the data passing between the two ends of the VPN. Encryption makes this data incomprehensible to anyone in between.

In summary, if you want to protect the privacy of your communications while enjoying the benefits of a proxy, a VPN is the most appropriate solution.

How to choose a VPN?

To benefit from the advantages of this technology, it is necessary to subscribe to a VPN service. However, choosing a VPN provider can be difficult given the proliferation of offers in recent years. This is a decision that should not be taken lightly.

When you use a VPN, your web traffic is routed through the VPN provider's servers, which implies a certain level of trust. Therefore, it is important to choose your VPN according to the following criteria:

Protection of information

To protect your privacy online with a VPN, you should pay attention to your VPN provider's privacy policy, especially regarding its handling of connection and activity logs.

Before choosing a VPN, make sure you understand how the provider handles this information and check their log retention policy.

Location of VPN provider

When choosing a VPN, it is crucial to check the location of the company and its servers. It is recommended to choose a provider based in a country with strict consumer protection laws.

Make sure you fully understand the location of your VPN provider before signing up with them.

Encryption protocols

To ensure the security of your VPN connection, it is important to choose a provider offering modern and reliable encryption protocols. Currently, the safest protocols are L2TP / IPSec et OpenVPN.

It is recommended to give preference to VPN providers that use an AES 256-bit encryption algorithm. The latter is considered more resistant to brute force attacks.

Before choosing a provider, also check that they use up-to-date encryption protocols. Indeed, outdated encryption algorithms can make your connection more vulnerable to attacks.

Service limitations

Before choosing a VPN, find out about any limitations offered by the provider, such as bandwidth, access time, number of simultaneous connections or possible service blockages.

Check the terms of service to make sure the service suits your needs before signing up for a VPN subscription.


Before subscribing to a VPN service, it is important to check if the VPN provider does not block certain protocols, in particular peer-to-peer. Make sure that the provider allows all necessary protocols for your online activities to avoid blocking or restriction.

Benefits of a VPN

  • The VPN improves the security of your internet connection.
  • It offers a high level of anonymity and hides your IP address.
  • It protects your data when you use public Wi-Fi networks.
  • It allows you to bypass geo-restrictions.
  • It protects you from the HADOPI law by allowing you to connect to a server in another country.

Disadvantages of a VPN

  • Some VPN providers may keep your logs.
  • A VPN can change the web pages you visit.
  • Some VPNs can censor websites.


In conclusion, there are plenty of reasons why you might want to use a VPN service.

Some of the reasons include:

  • Access to restricted sites.
  • Maintaining privacy when accessing the Internet.
  • And make your online activity anonymous.