A peripheral is a device that connects to the system unit and is controlled by the processor in the computer. Peripherals can include input devices and output devices, as well as some storage devices and communication devices.
Port - Most input/output devices are outside the computer case. These devices communicate with components inside the computer case through a wireless connection or through pcables attatched to the case at a connection called a port.
Computer Case - iGnani.com In this chapter, I will start by giving a brief about what is a computer made up of and follow it by giving a list of all the hardware components that are either placed in a computer case, or act as Input or output devices. Will end the chapter by explaining the computer case and the motherboard in detail.