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VPN or virtual private network is a tool that can be used for both personal and business means. It acts by establishing a secure network, through the creation of a virtual tunnel that's encrypted over a public network, usually the internet. Businesses used to lease private lines to connect their office branches, even those abroad, and the amount they spend is huge because network connectivity in a broad range is very expensive. Because of the availability of a VPN connection, companies were able to save money by getting rid of their private leased lines. The services that VPN can provide these companies are the same as the leased lines.

Aside from business or corporate use, a VPN connection can also be used personally by consumers, to be able to use applications that might not be permitted by their ISP, such as a VoIP, or which may be blocked by a firewall, or bypass website restrictions brought about by a country's censorship, like in China and the Middle East. With this scenario, a connection between the user and VPN provider is established, with the VPN company providing secure and private browsing through an encrypted connection, access to many blocked websites and applications, and the hiding of the user's IP address whenever visits websites happen.

See more: Best VPN programs

Some people are deeply concerned about the security of the communication that happens on the web, which is why the service that VPN can provide them is a plus for them. These people are worried that the data they send on the web be it in file type or communication that happens through VoIP can be retrieved by a third party. For professional hackers, accessing your data is an effortless process, especially if your system is unprotected. You can see the benefit that one can get from connecting to the web through a VPN, especially for companies that need to protect sensitive information from being leaked. By having a VPN connection, companies will no longer fear that someone will eavesdrop on their employees whenever they use the services of a VoIP to make phone calls or that data that they send through the web from being intercepted by other people.

A VPN can establish secure communications by using one of many protocols, which includes PPTP, IPSec, or SSL/TLS, to create a cryptographic tunnel. VPNs also use authentication methods, on top of the secure encrypted tunnels that they established. Before a user can connect to a VPN, a username and a password are required, use a digital certificate, and sometimes even make use of double authentication. Aside from the username and password, the user is asked to provide another password or PIN that can be found in a hardware token. The PIN in the token changes every so often, without it, the user will be unable to connect to the secure VPN connection.