A mid-tower case is a type of computer chassis that provides a balance between size and expandability. Typically, it stands about 15 to 20 inches tall and can accommodate various components, including motherboards, graphics cards, and storage drives. This size makes it suitable for both gaming and general-purpose computers. Mid-tower cases often feature multiple expansion slots and drive bays, allowing users to customize their systems easily. They also provide adequate airflow and cooling options, which are essential for maintaining optimal performance. Overall, mid-tower cases are popular among PC builders for their versatility and functionality.