Retro is a culturally outdated or aged style, trend, mode, or fashion, from the overall postmodern past, that has since that time become functionally or superficially the norm once again. The use of "retro" style iconography and imagery interjected into post-modern art, advertising, mass media, etc. It generally implies a vintage of at least 15 or 20 years.
The style now called "retro art" is a genre of pop art which was developed in the 1940s and 1950s in response to a need for bold, eye-catching graphics that were easy to reproduce on simple presses available at the time in major centres. Retro advertising art has experienced a resurgence in popularity since its style is distinctive from modern computer-generated styling.
Perhaps the most famous example of a retro pop-art character is the more generalized form of the Ward Cleaver-styled J. R. "Bob" Dobbs-esque icon which has been widely played off, copied, and parodied.