A virtual private network or VPN for short, is a way of connecting a computer to a remote network. Most people using computers connect to the World Wide Web using a normal network - they use dial-up or broadband. A VPN is a little bit different. It's used by some workers to connect using a laptop to do work - they can check their work email and see work websites which can not be seen on the normal internet.
VPN often offers anonymity by hiding the user and making it very hard for anyone to track them.
Recently VPN is often used to access to the websites blocked in some countries, like China.
Virtual private network Facts for Kids. Kiddle Encyclopedia.