A VNC server is a software application that allows users to remotely access and control another computer over a network. It works by transmitting the graphical desktop of the remote machine to the user's device, enabling them to interact with it as if they were sitting in front of it. This is particularly useful for troubleshooting, remote work, and accessing files or applications from different locations. The VNC (Virtual Network Computing) protocol is platform-independent, meaning it can be used across various operating systems, such as Windows, macOS, and Linux. To establish a connection, both the server and client must have VNC software installed, and the user typically needs to enter a password for security.