Bitumen is a thick, black, sticky substance derived from crude oil or found naturally in tar pits. It is primarily used in road construction as a binder in asphalt, and in building applications for waterproofing roofs, foundations, and other structures. Bitumen has strong adhesive and water-resistant properties, making it ideal for sealing and protecting surfaces. While it can be part of coatings or sealants, bitumen itself is not classified as paint or a typical construction adhesive.