Micro-ATX is a motherboard form factor that measures 244 x 244 mm (9.6 x 9.6 inches). It is designed to provide a balance between size and expandability, making it suitable for compact computer cases while still allowing for multiple expansion slots. This format typically includes up to four RAM slots and can support various components, such as graphics cards and storage drives. Micro-ATX motherboards are popular for budget builds and small form factor PCs, offering a good mix of performance and space efficiency.