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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...

A bartender is a person who serves beverages (usually alcoholic) behind a counter (or similar) in a bar, pub, tavern, or similar establishment. A bartender, in short, "tends the bar". The term barkeeper may carry a connotation of being the bar's owner. In addition to their core beverage-serving responsibility, bartenders usually maintain the supplies and inventory for the bar (though some establishments have barbacks who help with these duties)...