This document discusses bitumen, which is a black or dark brown material derived from petroleum that is used in civil engineering projects like roads and construction. It originates from natural asphalt deposits or is produced through refining crude oil, with the asphalt being the residue left over after distillation. The document outlines the basic refining process and lists some key engineering properties measured for bitumen like penetration value, softening point, and viscosity. It also provides details on common penetration grades available in India.