If you use a desktop computer, you might already know that there isn't any single part called the "computer." A computer is really a system of many parts working together. The physical parts, which you can see and touch. Starting from the mains system unit, the system unit is the core of a computer system. Usually it's a rectangular box placed on or underneath your desk. The most important of these components is the central processing unit (CPU), or microprocessor, which acts as the "brain" of your computer.
Another component is random access memory (RAM), which temporarily stores information that the CPU uses while the computer is on. Almost every other part of the computer connects to the system unit using cables. Lets talk about storage and what it does for us. Your computer has one or more disk drivesdevices that store information on a metal or plastic disk. The disk preserves the information even when your computer is turned off. Computers hard disk drive stores information on a hard disk, a rigid platter or stack of platters with a magnetic surface. Because hard disks can hold massive amounts of information, they usually serve as your computer's primary means of storage, holding almost all of your programs and files. But there is another type of storage option in modern computers, which was used as the main means to make data portable, known as the floppy disk. Floppy disk drives store information on floppy disks, also called floppies or diskettes. Its known that floppy disks can store only a small amount of data. For these reasons, floppy disk drives are less popular than they used to be, although some computers still include them. Now you think why are these small diskettes called floppy disks? Even though the outside is made of hard plastic, that's just the sleeve. The disk inside is made of a thin, flexible vinyl material. The rest of the computer features how you input data into it. A mouse is a small device used to point to and select items on your computer screen. Although mice come in many shapes, the typical mouse does look a bit like an actual mouse. It's small, oblong, and connected to the system unit by a long wire that resembles a tail. That is why it is called a mouse. A mouse usually has two buttons: a primary button (usually the left button) and a secondary button. Many mice also have a wheel between the two buttons, which allows you to scroll smoothly through screens of information. The other type to input data is the keyboard. A keyboard is used mainly for typing text into your computer. Like the keyboard on a typewriter, it has keys for letters and numbers, but it also has special keys.
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