Artoo, also known as R2-D2, is the loyal droid of Luke Skywalker in the Star Wars franchise. Artoo is an astromech droid, meaning it is designed to help with repairs and navigation in space. It is a small, cylindrical robot with a dome head, and is often seen beeping and whistling in its own language. Artoo is a beloved character in the Star Wars universe, and is often referred to informally as Artoo-Detoo or simply Artoo.