Micro ATX motherboards are a type of computer motherboard that measure 244 x 244 mm (9.6 x 9.6 inches). They are designed to fit in smaller cases while still providing essential features for building a functional computer. Micro ATX boards typically have up to four expansion slots, allowing users to add components like graphics cards and sound cards. These motherboards support a variety of processors and memory types, making them versatile for different computing needs. They are popular for budget builds and compact systems, striking a balance between size and functionality. Many users choose Micro ATX for gaming, office work, or home theater PCs.