A computer case, also known as a tower or chassis, is the housing that contains and protects the components of a desktop computer. It provides a physical structure for the components, and also helps to dissipate heat generated by the components. Computer cases come in a variety of sizes and shapes, with different form factors such as ATX, Micro-ATX, and Mini-ITX, to accommodate different sizes of motherboards and components. The case also has openings for ports and expansion slots, and may have built-in features such as fans and LED lighting. A computer case can impact the overall appearance and performance of a system, and some users prefer to choose a case with a specific design or features to match their aesthetic preferences.