Software to interact using the Protocol developed by Microsoft which provides a user with a graphical interface to connect to another system over a network connection.
Usecase: Compromising other hosts with valid credentials
Deploy a TCP/UDP tunnel or proxy agent such as Chisel or Ligolo. Once on the internal network, connect to the first machine via xfreerdp (Linux) or Remote Desktop Connection (Windows). Open up the Windows start menu and type in Remote Desktop Connection. Click on it and enter in the IP address of a host on the network. You can now pivot to another host with valid credentials. Alternatively, something headless such as SharpRDP can be used. If RDP isnt enabled but you have credentials for a domain admin, or a user with administrative access to the target system, you can possibly use crackmapexec to enable RDP.