Windows Deployment Services (WDS) is a Microsoft technology that allows network-based installation of Windows operating systems. It enables administrators to deploy images of Windows to multiple computers simultaneously, streamlining the setup process in large environments. WDS supports both PXE (Preboot Execution Environment) and multicast deployments, making it efficient for organizations with many devices. By using WDS, IT professionals can manage and distribute operating system images, reducing the time and effort required for installations and updates across a network.