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A POTD is an acronym for "Photo of the Day", "Picture of the Day", "Post of the Day" or "Poll of the Day". It is a term most commonly used by online digital photography communities as an honor to outstanding photos that are selected daily from among that community's membership. They can either be tagged as POTD or displayed in a special page on that site...

Retro is a culturally outdated or aged style, trend, mode, or fashion, from the overall postmodern past, that has since that time become functionally or superficially the norm once again.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...