Answer Description

Virtual Private Network (VPN) is a tool that provides an encrypted secure tunnel between two networks or between a client device and a network. Enterprises use VPNs to allow secure connection of mobile devices like laptops and smart devices to the internal company network. Typically when you are in a company office a VPN will not be needed, but when you are working from a coffee shop or from home then a VPN can give you secure access to company servers and systems.

Wikipedia

A virtual private network (VPN) extends a private network across a public network and enables users to send and receive data across shared or public networks as if their computing devices were directly connected to the private network. The benefits of a VPN include increases in functionality, security, and management of the private network. It provides access to resources that are inaccessible on the public network and is typically used for remote workers. Encryption is common, although not an inherent part of a VPN connection.A VPN is created by establishing a virtual point-to-point connection through the use of dedicated circuits or with tunneling protocols over existing networks. A VPN available from the public Internet can provide some of the benefits of a wide area network (WAN). From a user perspective, the resources available within the private network can be accessed remotely.