The Marvel Cinematic Universe (MCU) is a media franchise and shared universe centered around a series of superhero films and television series produced by Marvel Studios. It is based on characters that appear in American comic books published by Marvel Comics. The franchise is known for its interconnected storylines and characters, creating a cohesive narrative across multiple films and shows. Since its inception with Iron Man in 2008, the MCU has expanded to include numerous films and series, featuring iconic characters like Captain America, Thor, and Black Widow. The franchise has become a cultural phenomenon, influencing the superhero genre and achieving significant commercial success worldwide.