A CPU board, also known as a motherboard or mainboard, is the primary circuit board that connects all the components of a computer system. There are several synonyms for a CPU board, including system board, main circuit board, logic board, and baseboard. Other related terms include expansion card, which refers to a board that adds additional functionality to the mainboard, and chipset, which refers to the integrated circuits that control communication between different components on the board. Regardless of the term used, the CPU board is the central hub for a computer system and is essential for its proper functioning.