A classification yard, also known as a hump yard, is a complex of railroad tracks where incoming freight cars are sorted based on their destination. Synonyms that are commonly used to describe a classification yard include switching yard, marshalling yard, sorting yard, or a shunting yard. These terms describe the same function but are used differently based on geography and the specific railroad language. A classification yard is an essential operation for the efficient movement of freight across a network, and the terms switch yard, marshalling yard, sorting yard, or shunting yard all refer to the same essential function of this critical feature of the railroad infrastructure.