Mini-ITX motherboards are compact circuit boards designed for small form factor computers. Measuring just 17 x 17 centimeters (6.7 x 6.7 inches), they are ideal for building space-efficient systems without sacrificing performance. These motherboards typically support a single CPU socket and a limited number of expansion slots, making them suitable for basic computing tasks and home theater PCs. Despite their small size, Mini-ITX motherboards can accommodate essential features like integrated graphics, multiple USB ports, and support for DDR4 RAM. They are popular among enthusiasts who want to create custom builds that are both powerful and compact, offering a balance between size and functionality.