VPN (Virtual Private Network) is a private network on a public network like the Internet. VPNs are available to users as software or app or browser add-on. They may be free, freemium or paid.
VPNs encrypt the data following between your device and the Internet protecting you against eavesdropping. Using an encrypted connection to send and receive sensitive information over the Internet is strongly recommended.
VPNs hide your location. Typically a VPN facilitates you to choose servers from a country. Your real location remains private and often you will be able to access a website blocked in your country - provided it is available in the country you selected the server from.