Micro ATX cases are compact computer enclosures designed to house Micro ATX motherboards, which are smaller than standard ATX boards. These cases typically measure around 9.6 x 9.6 inches, allowing for a more space-efficient build while still providing essential features like expansion slots and drive bays. Despite their smaller size, Micro ATX cases can accommodate various components, including graphics cards and power supplies. They are popular among gamers and casual users alike, offering a balance between performance and space-saving design, making them ideal for small desktops or home theater setups.