What is the main function of Remote Desktop in Windows?

The primary function of Remote Desktop in Windows is to provide remote access to a device. This feature allows users to connect to another computer over a network and interact with it as though they were physically present at that machine. This capability is especially beneficial for remote administration and troubleshooting, as it enables users to run applications, manage files, and perform various tasks directly on the remote system from a different location.

Using Remote Desktop, users can fully control the remote desktop environment, including accessing files and applications, without needing to be in the same physical space as the computer they're accessing. This functionality is crucial for IT support personnel, employees working from home, or anyone who needs to access their work computer or server from a distance.

The other options focus on different aspects of network and system management but do not capture the essence of what Remote Desktop is designed to do. For instance, file sharing pertains to the transfer of documents and data, while remote system management and application performance optimization are not the core functionalities offered by Remote Desktop.