F.R.I.D.A.Y. is an artificial intelligence created by Tony Stark, designed to work with his Iron Man armor. She served as Stark's main artificial intelligent computer system during the final battle between the Avengers and Ultron in Sokovia. In contrast to J.A.R.V.I.S.'s voice code which was patterned after an English accent, F.R.I.D.A.Y.'s is patterned after an Irish one.
After uploading J.A.R.V.I.S.'s pattern into the Vision, Tony Stark chose F.R.I.D.A.Y., from a pool of multiple back-up artificial intelligences, to assist him during the Battle of Sokovia.
F.R.I.D.A.Y. monitored that Ultron did not escape into the internet when Vision attacked the foe.
- In the comics, Friday was an AI created by Tony Stark to work as his secretary, her name originating from the term "girl Friday", meaning go-to person.