A virtual private network (VPN) extends a private network across a public network, allowing users to send and receive data as if their computers were physically linked to the private network. Increased functionality, security, and control of the private network are all advantages of using a VPN. It is frequently used by telecommuting workers to gain access to resources that are not available on the public network. Although encryption is widespread, it is not a requirement of a VPN connection. A VPN is formed by using dedicated circuits or tunnelling technologies to build a virtual point-to-point connection over existing networks. Some of the benefits of a wide area network can be obtained using a VPN accessible via the public Internet (WAN). The resources provided within the private network can be ACCESSED remotely from the user's perspective.

The different types of VPNS are as follows:

• Access VPN: Access VPN is a type of virtual private network that allows remote mobile users and telecommuters to connect to the internet. It can be used as a substitute for dial-up or ISDN (Integrated Services DIGITAL Network) connections. It is a low-cost option with a wide range of connectivity options.
• Site to Site VPN: A Site to Site VPN, also known as a Router to Router VPN, is a type of virtual private network that connects the networks of two offices in different locations. As LISTED below, there are two subcategories:
  • Intranet VPN: An intranet VPN connects remote offices in different geographic areas using common infrastructure (internet connectivity and servers) and the same accessibility policies as a private WAN (wide area network).
  • Extranet VPN: Extranet VPN connects intranet users, suppliers, consumers, partners, and other entities via dedicated connections using shared infrastructure.