Pop Art was an art movement that began in the late 1950s and used imagery from popular culture and everyday life. Pop artists blurred the lines between fine art and commercial art by using things like advertisements, consumer goods, celebrities and common objects as subject matter. They used techniques like silkscreening, mass production and photography. One of the most famous Pop artists was Andy Warhol, who appropriated images from popular culture and used repetition to critique and comment on society and culture. Pop art challenged definitions of art by raising questions about what makes one work better than another and what art should represent. It stretched concepts of art-making and reflected ideas still seen in art today.