Computers come in many different sizes, types (examples : desktops, laptops) and have varied processing power and capabilities, but the main components that make up a computer pretty are generally the same. The main computer components are also frequently called the computer's"hardware" or electronic parts. In this chapter we will explain the various components in PC computers and how they work together. This will help you understand how your computer works to do all of its tasks fast and reliably. This chapter will provide you with a basic knowledge of computers. There is no better place to start than with the basics because knowing the information in this chapter can help you use, program, buy,repair, maintain or even build your own computer.