VPN, or Virtual Private Network, is a popular tool used for encrypting and protecting data transmitted through public networks (such as the Internet) and private networks. Many websites and services are not secure, and hackers and criminals can easily access your personal information. However, with the help of a VPN, your personal data and devices are protected and secure. 

VPNs are used for various purposes. They can protect your privacy and security when you use public Wi-Fi, and they can also be used to hide your IP address and location. VPNs are used to send and receive data securely, which is useful when you are using a public Wi-Fi hotspot or an Internet Service Provider (ISP) with a public Wi-Fi hotspot.