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A mat is a generic term for a piece fabric or flat material, generally placed on a floor or other flat surface, and serving a range purposes including: providing a regular or flat surface, such as a mousepad. protecting that which is beneath the mat, such as a place mat or the matting used in archival framing and preservation documents and paintings. protecting that which is above the mat, such as a wrestling or gymnastics mat, or an anti-vibration mat...

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...