microATX is a type of motherboard size that measures 244 x 244 mm (9.6 x 9.6 inches). It is smaller than the standard ATX motherboard but larger than the mini-ITX. This size allows for a balance between expandability and compactness, making it suitable for various computer builds, including gaming and home office setups. MicroATX motherboards typically feature multiple expansion slots, allowing users to add components like graphics cards and sound cards. They also support a range of CPU sockets and memory types, providing flexibility for different PC configurations while fitting into smaller cases.