Paved is a term used to describe a surface that has been treated with a material such as tar or asphalt. Tarring is the process of applying tar, a sticky black substance, to a surface in order to make it waterproof and durable. Asphalting is the process of applying asphalt, a mixture of bitumen and aggregate, to a surface in order to make it smooth and durable. Both tarring and asphalting are commonly used to pave roads and other surfaces.