Walt Disney is an influential filmmaker known for revolutionizing the film industry in the 20th century. He popularized the use of animation, introducing iconic characters like Mickey Mouse and producing groundbreaking films such as "Snow White and the Seven Dwarfs," which was the first full-length animated feature. Disney's vision extended beyond animation; he pioneered the theme park concept with the opening of Disneyland in 1955, transforming entertainment experiences. His legacy continues to impact popular culture, inspiring creativity and innovation in the film industry and beyond.