What is the Meaning of VPN | Definition and Concepts

A VPN or Virtual private network is a technology that allows the extension of a public network such as the Internet to a local network space. In computer science a Virtual private network (VPN) or Virtual Private Network (VPN) is a networking technology that, for reasons of cost and convenience, offers the possibility to connect to a public network generating an expansion at the local area level. For instance, such networks are used when connecting two or more offices of a company via the Internet. This facilitates connection and at a low cost-sharing, and allowing members of one team to connect each other from remote locations.
Them VPN work of way such that, while is used a network public as is the of connection to Internet, them data are transmitted by a channel private, so not is in danger the security or the integrity of the information internal. The data are encrypted and decrypted Alternatively, saving money and problems to companies of different scale.
If you consider the cost that would connect two offices in two different countries, VPNS are an excellent alternative that relies on existing technology of interconnected networks to create a network of smaller and more private.
In terms of architecture, there are three types of VPNs: remote access VPN, the VPN point to point, and the internal VPN. With regard to the connection, this can be from access remote, VPN router to router, and between firewalls.
For many companies today the configuration of a Virtual Private Network is the maintenance of the integrity and confidentiality of the data, while at the same time costs are reduced and facilitates the use, and ultimately strengthens communication within the organization.