Except private computers consisting of a basic working unit , it usually includes the keyboard, mouse, memory or RAM, hard disk, DVD drive, monitor to make it functional. You can customary buy the whole computer system with the processing item , keyboard, mouse, memory, hard disk, DVD drive, monitor and other elements , unless you would like to buy each component separately. Online or walk-in stores are great places to buy a personal computer for home or business use. Let us discuss a few main computer components in the following sections.

Keyboard is an important element for a computer system. Consumers like you will need a device such as a keyboard to enter your words and commands for the computer. It is an input mechanism you will use to answer questions from a website while ordering an unit , making an article or essay, to enter registration information to a new website. Each key depict an alphabet, number, function, spacebar, alt, ctrl, and action keys like Insert, Delete, Home, Page Up, Page Down, Home, End, arrows and other keys. Each time you press a key on the keyboard, it sends a signal through the area underneath called Key Matrix Circuit to the computer. The connection from a keyboard to the computer is accomplished with a cable to a PS/2 or USB connection.

Another major element is the mouse, which is mostly used for clicking a button, checkbox, option box, or to move around the screen on the Computer Monitor. It is very useful if you are drawing on the screen, like painting a picture or drawing a flowchart. There are basically ball mouse, optical mouse, and laser mouse types. A ball mouse is a mouse with a round ball under the casing, moving the mouse on a mouse pad will move the ball and then send the signal to the computer for the moving around . An optical or laser mouse both use optical to send signal to the computer, the difference is an ocular mouse uses light-emitting diode or photo diode to find the movement, while laser mouse uses infrared laser diode to feel the motions. Diodes are an electronics component that generally ejects light. The connection from a keyboard to the computer is achieved with a cable to the RS-232C, PS/2 or USB connection on the computer.

Memory components such as Random-Access memory or RAM or hard disk are important for the computer storages. RAM is basically used for temporary storage of data, and the data will be canceled after exiting software, restarting or turning off the computer. The large size the RAM the higher performance and faster the computer will work , because the computer can do most of the work on it without copy data back and forth from the hard disk. Hard disk is a permanent storage device for the computer, saved data will stay there until they are erased.

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