Squirrel.Windows is a framework for installing and updating Windows desktop applications via HTTP. It functions as an application installer, background software updater, and distribution system that operates without the use of traditional installation wizards.
The framework uses NuGet packages to distribute software and reduce download sizes through delta updates. It manages software releases by organizing updates into distinct HTTP channels to control how different user groups receive new versions.
The system handles deployment through user-mode directory installation to avoid administrative prompts and system reboots. It manages the software lifecycle using atomic update swapping, where new versions are prepared in temporary folders before being applied silently in the background.