The motherboard is also called the host board (mainboard), the systemboard (systemboard) or the motherboard (motherboard); It is divided into commercial motherboard and industrial motherboard two kinds. It is installed in the chassis and is one of the most basic and important components of the microcomputer. The main board is generally a rectangular circuit board, which is installed with the main circuit system of the computer, which generally has the BIOS chip, I\/O control chip, key and panel control switch interface, indicator connector, expansion slot, DC power supply connector of the main board and card.
The main board adopts an open structure. Most of the motherboards have 6-15 expansion slots for the PC peripheral control card (adapter) to plug in. By replacing these cards, the corresponding subsystems of the microcomputer can be locally upgraded, so that manufacturers and users have greater flexibility in the configuration of models. In short, the motherboard plays an important role in the entire microcomputer system. It can be said that the type and grade of the motherboard determine the type and grade of the entire microcomputer system. The performance of the main board affects the performance of the whole microcomputer system.