What is the main function of a VPN?

The main function of a VPN, or Virtual Private Network, is to create a secure connection over the internet. This is achieved through encryption and tunneling protocols, which protect the integrity and confidentiality of the data being transmitted. A VPN allows users to connect to a private network securely over a public network, making it safer to access sensitive information without the risk of interception by unauthorized parties.

Using a VPN effectively masks the user's IP address and can make it appear as though they are accessing the internet from a different location. This security feature is crucial for protecting data, especially for those who use unsecured networks, such as public Wi-Fi.

The other options relate to different functionalities that are not the primary purpose of a VPN. Providing a public IP address does not align with the main security functionality of a VPN, and monitoring network traffic is more about network management rather than securing connections. Additionally, while some users might experience improved speeds due to less congestion or other factors, a VPN is primarily designed for security rather than enhancing internet speed.