: A computer case is an area that carries the main components of a computer. It is also called computer chassis , cabinet , box , tower , enclosure , housing or just case. The computer case helps to keep important components such as power supply , motherboard , RAM , graphics card , LAN card , sound card , hard disk , CD / DVD ROM drive or Writer in one frame. Computer cases are usually made of steel (steel , electrically chromate coated or SECC) or aluminum. Many times plastic and wood materials are also used in it. The computer's power supply unit is usually built-in inside the casing.