Pop art emerged in the 1950s in both London and New York as a rebellion against abstract expressionism. It celebrated popular culture and mass media by using imagery from advertisements, comic books, and everyday objects. Key pop artists included Andy Warhol, Roy Lichtenstein, Robert Rauschenberg, and Claes Oldenburg. They used techniques like silkscreening to portray celebrities and brand icons. While initially controversial, pop art blurred the lines between high and low art and made art more accessible and enjoyable for the public.