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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...

Car tuning is a generalized term referring to the act of improving the performance or appearance of a vehicle. For actual "tuning" in the sense of automobiles or vehicles. Most vehicles leave the factory set up for an average driver's expectations and conditions, tuning on the other hand, has become a way to personalize the characteristics of a vehicle to the owner's preference. Cars may be altered to provide better fuel economy, produce more power, or to provide better handling...