What is the role of the Mad Titan in the Marvel Cinematic Universe (MCU)?

Thanos is the central antagonist of the Marvel Cinematic Universe, specifically in the films *The Avengers* and *Avengers: Infinity War* and *Avengers: Endgame*. He seeks to eliminate half of all life in the universe to restore balance. The MCU portrayal significantly expanded upon the character's backstory and motivations, offering a more sympathetic, albeit still villainous, perspective.