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VPN is software that establishes a virtual bridge between a user and a server. This is more commonly called a VPN tunnel because it ensures the safety of the data passing through it. The data is encrypted between the VPN client and server using a strong cipher. It is also used to anonymize the user (hiding the user's location, IP address, etc.) and bypass blocking access to Internet resources. With VPN, companies can protect their data on the Internet with the help of VPN technology. VPN technology is required for:.computing of several offices, geographically located in different places, into one secure private network.