Coking coal, also known as metallurgical coal, refers to a type of coal that is used for the production of coke, a fuel commonly used in the steelmaking industry. There are various synonyms for coking coal, including hard coal, anthracite, bituminous coal, and black coal. Hard coal typically has a higher carbon content and lower volatile matter compared to soft coal, which makes it an ideal choice for metallurgical purposes. Anthracite coal is a type of hard coal that has a high luster and low impurities, while bituminous coal is a type of soft coal that is commonly used for generating electricity. Black coal is a broad term used to describe any coal that has a black color, which can include both coking and non-coking coals.