Bitumen is also known as asphalt, it is sticky, black and highly viscous liquid or a semi-solid form of petroleum. It may be found in natural deposits or might be a refined product and is classed as a pitch. Before the 20th century, the term asphalt was also used. The world is derived from the ancient Greek asphaltos. Asphalt is used in road construction, it is used as the glue or binder mixed with aggregate particles to create asphalt concrete. There are four other main uses for bituminous waterproofing products, including production of roofing felt and for sealing flat roofs. Bitumen are often used interchangeably which means both natural forms of substance can be used. Asphalt cement is commonly used for a refined residue from the distillation process of selected crude oils. Outside in united states, this product is often called as bitumen and worldwide geologist often prefers the term for the naturally occurring variety.