1950s - 1960s
Pop Art mainly focuses on "mainstream" subjects, or things popular during the time. Comic books, iconic logos like Campbell's Soup and celebrities, like Marilyn Monroe, were popular during the 50s.
Pop Art emphasizes on youth culture. Thus, it utilizes bright colors, large sizes. It "pops"! Pop Art was mainly popular in the United States of America, thus it showed American Youth Culture.
Silk-Screening and Poster-Making were the main techniques used in this kind of Art.
Andy Warhol is most likely the best known artist under the category of Pop Art. He was not only an artist, but an underground filmmaker and fashion designer as well. Aside from the "Marilyn Diptych", he also created the popular "Campbell's Soup Cans" print, which plays on the colors of America's then most popular logo.
Although many revered artists may disagree, most Pop Art has some hidden meaning in it. The work above, "Marilyn Diptych" by Andy Warhol, actually has another copy taped right beside it. However, the other side is completely black and white, with some squares distorting her face. Some suggest Warhol wanted to show her colorful life as America's Sweetheart on one side, and her untimely supposed suicide/murder on the other. [The other side was notably created after her death.]