There are two main components of a computer system is hardware and software. Computer hardware is the device can be seen with the eye, and touch such as monitors.The CPU is Central Processing Unit is responsible for processing information. The second is the memory Memory unit is responsible for the data memory is divided into two types of ROM is Read only Memory is memory that can be recalled at any time and RAM is Random Access Memory memory is limited to information that is open to the computer. Peripherals are classified into three types: input, output and storage devices . Input devices are such a keyboard and mouse. Output devices are such a monitor and printer. The operating system and the computer language variables. Second application software is the software and the software used to accomplish specific tasks. Software can be divided into two categories : application software and system software. Hardware is mechanical and electronic equipment.