Computer hardware is divided into five major components: arithmetic unit, controller, memory, input devices and output devices,
Arithmetic Unit and the controller is the core of the computer, called the Central Processing Unit (Central Processing Unit, CPU) or processor, the CPU internal as well as some high-speed storage Unit,
Called registers, the alu performs all the arithmetic and logical operations; The controller is responsible for the detailed instruction from memory, after decoding to computer various control command;
Register for processing unit to provide data needed for operation,
Memory is the memory of the computer parts, used to store programs and data involved in the program, it is divided into internal memory and external memory,
Internal storage used to hold the executing program and use of data, the cost is high, volume small, but fast,
External memory can be used to save a large number of programs and data for a long time, its low cost, large capacity, but slower,
Input devices and output devices are collectively referred to as peripheral equipment, hereinafter referred to as a peripheral or I/O devices, used to achieve human-computer interaction and communication between machine,
That is commonly used in micro computer input device has a keyboard, mouse, etc., output devices are monitors, printers, etc.,

Computer Software (Computer Software) is indispensable in the process of using the Computer, the Computer Software can make Computer accomplish a specific function in booked in advance order
Computer software according to its function is divided into system software and application software
System software: DOS (Disk Operating System), Windows, Linux, Unix, Mac, Android, iOS
Application: office QQ chat YY language minesweeping