OS-tan, also known as Operating System Girls, is a subgenre of moe anthropomorphism that personifies computer operating systems as anime-style characters. Originating on the Japanese imageboard Futaba Channel in the early 2000s, the trend began with the clumsy 'Me-tan' representing the unstable Windows ME and quickly expanded to include every major OS from Windows 95 to Linux and macOS. These characters often embody the perceived reliability, age, and personality of the software they represent; for instance, Windows XP is often depicted as a reliable but dated worker, while Windows Vista is portrayed as a resource-heavy character. Today, OS-tans remain a staple of internet tech culture, used to satirize system updates, blue screens of death, and the ongoing rivalries between different software ecosystems.