XP-tan is a moe anthropomorphism of the Microsoft Windows XP operating system in the OS-tan series, which originated as an internet meme among Japanese imageboard communities. Portrayed as a cheerful, energetic girl with a distinctive green and white school uniform, XP-tan represents the reliability and popularity of the Windows XP OS. She is often depicted as the younger sibling of other Windows-tans and plays a central role in the OS-tan universe, embodying both the strengths and quirks of the XP platform.