Pop art is an art movement that emerged in Britain and the United States during the mid- to late-1950s. The movement presented a challenge to traditions of fine art by including imagery from popular culture, such as advertising, comic books, and normal everyday objects.
Known for his photo collages and paintings of Los Angeles swimming pools, David Hockney is considered one of the most influential British artists of the 20th century.
Roy Lichtenstein was an American Pop artist best known for his boldly colored renditions of comic strips and advertisements. He would take small comic strip art and make it huge, so you could see the pixels.