Pop art is an art based on modern popular culture and the mass media, especially as a critical or ironic comment on traditional fine art values.
It emerged in the mid-1950s in Britain and in the late 1950s in the United States, eventually spreading all over the world. In pop art, material is sometimes visually removed from its known context, isolated, and/or combined with unrelated material. laes Oldenburg, Jim Dine, Tom Wesselmann, Andy Warhol, Jasper Johns, James Rosenquist, and Roy fox Lichtenstein were some of the most relevant pop art artists at the time.
Samples:
Tutorial Link:
http://www.photoshoptutorials.ws/photoshop-tutorials/photo-effects/pop-art/
Before And After: