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Peripherals are defined as auxiliary tools that connect to the computer, either externally or internally. To be quite technical, a peripheral is anything outside the core elements of a computer which include: the central processing unit, the power supply, the motherboard and the computer case. However, for a computer to really function as we know it, a random access memory, hard drive and other components are necessary as well. Peripherals expand a computer's given abilities and are given that name because in nature, the term "peripheral" usually refers to an optional piece of equipment. Sometimes, however, peripherals are built into the computer, such as the keyboard on a laptop, and would cause a bit of trouble if it was to be removed. There are many different types of peripherals, including buses, which are subsystems that possess the ability to send data from one computer component to another. Buses both logically and physically connect other peripherals. There are both external and internal buses. 
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The network card is another type of peripheral, which is an expansion card and permits communication between computers on a computer network. A firewire is a serial bus interface that is commonly found in personal computers. Modern digital video cameras have also begun to use a firewire connection. Zip disks are an example of an external peripheral. They're larger than traditional floppy disks, not too expensive and long-lasting.They have become the favorite method for transferring large files such as music libraries. Another type of peripheral is removable storage. Despite the fact that computer storage has increased astronomically since the birth of such technology, removable storage has become more and more common in every day life. Flash drives are by far the most popular form of removable storage but CDs, DVDs, bluRays discs and floppy drives are different examples of removable storage. Flash drives come in many different denominations, up to and beyond 32 GB and do not have mechanically driven components, unlike hard drives, thus making them longer lasting and smaller, which is almost always a plus in the technology world. They also come in fun and funky designs! Peripherals are important parts of almost every computer and they make the computing experience more enriched and intricate.

http://pcsupport.about.com/od/termsns/g/peripheral.htm http://computer.howstuffworks.com/computer-peripherals-channel.htm http://www.webopedia.com/TERM/P/peripheral_device.html

http://openbookproject.net/courses/intro2ict/hardware/peripherals.html http://education-portal.com/academy/lesson/what-are-peripheral-devices-of-a-computer-definition-examples-types.html#lesson

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