MicroATX 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 desktop computers. MicroATX motherboards typically offer multiple expansion slots, allowing users to add components like graphics cards and sound cards. This form factor is smaller than the standard ATX motherboard but larger than the Mini-ITX variant. MicroATX cases are often more affordable and easier to fit into smaller spaces, making them a popular choice for budget builds and home theater PCs.