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A computer is made of a number of components. Some of the parts that are normally used with a computer do not come attached along with it, and they have to be externally plugged in. Simply defined, computer peripherals are types of hardware that are added to host-computers for the purpose of expanding the machines abilities. In fact, these items are optional when it comes to computers. However, because of their increasing importance and functionality, these peripherals are also being used on a regular basis. They are used along with other commonly used computer components, and are used by millions of people around the world. Devices such as a monitor, CPU, and so on are not considered to be peripherals because they are mandatory for the use of a computer. Computer peripherals also refer to those devices that are hooked up to a computer externally or even internally through some type of a computer bus, such as a USB. Most peripherals can also be categorized by the way they are connected to a computer. These devices include ones such as printers, scanners, joysticks, etc. The list of computer peripherals includes CDs, DVDs, Floppy disks, Punch cards, keyboards, image scanners, web cams, printers, speakers, microphones, graphic cards, monitors, modems and so on. Before the invention of the personal computer, devices such as the motherboard, CPU and memory were also considered to be peripherals because they had to be connected externally. Peripherals are considered to be extremely important because they enhance the ability of a computer that would otherwise be quite limited. The peripherals used nowadays help a computer to receive information to be processed, and they also help it to display it to the user. Hence, without the presence of computer peripherals, there is no way that a computer can perform its described job effectively.