Central Processing Unit- The purpose of the central processing unit is to serve as a “brain” or a “decision maker.” The Central Processing Unit can be compared to a police officer directing traffic on a heavy rush hour day. The Central Processing Unit is responsible for storing and retrieving files and other media on the computer system. Without the Central Processing Unit, the computer has no purpose for its use. The Central Processing Unit is what all software and hardware is connected to, which can also be compared to a basic motor vehicle. The engine is what the car needs to serve its purpose. Very important peripherals are connected to the Central Processing Unit. Certain things that are connected to the CPU is the printer, monitor, microphones, the keyboard that I am typing on now, and many other tangible items like scanners and digital cameras. Hard Drive- A hard drive is what every computer system needs to be used for its intended purpose. The purpose of a hard drive is to store changing digital information in a relatively permanent form. Just say for instance, if you don’t have any floppy disks or compact discs at the time and you really need something to be stored on the computer for the next day’s use. You can store many things on the computer’s hard drive so that you won’t find yourself having to type that twenty-page research paper over again. It’s also a newly updated technological advance for items such as digital cameras. Another main purpose of the hard drive is to provide backup for certain instances such as if your computer breaks down by shutting off or even shorting. Random Access Memory- Random Access Memory, or RAM, is the place in a computer where the operating system, application programs, and data are kept so they can be quickly accessed by the computer at any given time. This can only happen when your computer is running. As soon as the computer is turned off, the Central Processing Unit looses all of its Random Access Memory. Random Access Memory can be compared to a person’s short-term memory. You can remember something that someone says in a lecture the same day of it, but a month, or even a week later, I doubt anyone will remember exactly what the professor said. RAM is very small in physical size and in the amount of data it can hold. It is smaller than the hard disk that can hold forty billion bytes. RAM is called “random access” because any storage location can be accessed directly. In addition to disk, floppy disk, and Compact Disc ROM storage, another important form of storage is read only memory, which is a more expensive kind of memory that retains data even when the computer is turned off. Read Only Memory- Read Only Memory plays a very important part in making computers much easier to use. Read Only Memory is the type of memory chip that does not lose information even when the computer’s main power is turned off. It is used as a storage medium and this is very useful to one’s who are typing and the computer happens to shut off on them. Most computers usually contain a very small amount of read only memory that keeps instructions for starting up the computer. ROM is a permanent type of memory storage used by the computer for important data and information that does not change. Keyboard- A keyboard allows any computer user to be able to type and relay information, in words, the computer system. With the addition of applications such as Microsoft Works and Word, the user is able to type information inside of the application to prepare the file for whatever use that is possible, such as emailing the document, printing, or any other use that is possible. Without a keyboard, very important options, such as surfing the web and using search engines, or luxury items, such as emailing a friend or a corporation about any type of issue, would not be able to be done. The absence of the keyboard would take away the whole reason for even owning a computer. Just incase your mouse ends up failing you for some odd reason, the keyboard will then be your “Savior” because, without the mouse, the keyboard will be the only way that you could control the computer until you purchase another mouse.