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 on a computing device, eg, a laptop, desktop, smartphone, across a VPN may therefore benefit from the functionality, security, and management of the private network Encryption is a common, though not an inherent, part of a VPN connectionVPN technology was developed to allow remote users and branch offices to access corporate applications and resources To ensure security, the private network connection is established using an encrypted layered tunneling protocol, and VPN users use authentication methods, including passwords or certificates, to gain access to the VPN
Virtual_private_network - Wikipedia, the free encyclopedia