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 Applications running across a VPN may therefore benefit from the functionality, security, and management of the private network It provides access to resources that may be inaccessible on the public network, and is typically used for telecommuting workers Encryption is a common, although not an inherent, part of a VPN connectionA VPN is created by establishing a virtual point-to-point connection through the use of dedicated circuits or with tunneling protocols over existing networks
Virtual_private_network - Wikipedia, the free encyclopedia