Added VPN Description

README.md

@@ -2016,6 +2016,8 @@ Before hosting one, please see [shortcomings](https://en.wikipedia.org/wiki/URL_
 
 **[`^        back to top        ^`](#)**
 
+A [virtual private network (VPN)](https://en.wikipedia.org/wiki/Virtual_private_network) 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.
+
 **Please visit [awesome-sysadmin/VPN](https://github.com/awesome-foss/awesome-sysadmin#vpn)**