The term 'Paving Surface' refers to a surface that has been prepared for use as a road, walkway, or other type of paved area. The most common type of paving surface is asphalt, which is made up of a mixture of TAR, gravel, and sand. TAR, which is also known as bitumen, is a black, viscous material derived from petroleum. It is used to bind the gravel and sand together, creating a strong and durable surface. TAR is often abbreviated as 'TAR' in crossword puzzles.