Short for Windows Server Update Services, WSUS is a program that runs on the Windows Server operating system, allowing IT administrators to choose and deploy specific Windows and other Microsoft software updates to computers on the network. The WSUS program was originally released on March 22, 2005 and makes the process of updating multiple computers on a network more efficient, removing the need to update each computer individually. The WSUS program sends the updates to each computer and automates the installation of the updates.
WSUS built upon the previous Software Update Services (SUS) program by including administration of patches, hotfixes and updates for other Microsoft programs besides Windows.
Also see: Windows update