J.A.R.V.I.S. stands for "Just A Rather Very Intelligent System." It is an artificial intelligence system created by Tony Stark, a character from the Marvel Comics universe. J.A.R.V.I.S. assists Stark in various tasks, including managing his home, operating his suits, and providing information during battles. In the Marvel Cinematic Universe, J.A.R.V.I.S. is voiced by Paul Bettany and serves as a key support system for Iron Man. The character evolves throughout the series, eventually becoming the foundation for Vision, another significant character in the franchise. J.A.R.V.I.S. exemplifies advanced AI capabilities in a fictional context.