J.A.R.V.I.S. (Just A Really Very Intelligent System) is an AI butler created by Tony Stark. J.A.R.V.I.S. often provides system monitoring for Stark when Tony operates the Iron Man armor. J.A.R.V.I.S. is quick to tell Avengers on certain topics, and is almost completely unbiased.
In the episode "Emperor Stark", The Vision uploaded J.A.R.V.I.S.' programming into his body and in tandum, worked with The Vision to update him on what had happened to The Avengers during the 30 days he was being repaired.
Background in other media
- In the Marvel Comics, J.A.R.V.I.S. is named after Edwin Jarvis, the personal butler of Tony Stark. http://jarvis.ai-dot.net/markIII.html