All About Computer

Introduction:
A computer is acquiring the parts. This guide will start with a quick explanation of essential parts and elaborate on them further on.

A computer is made up of a case, also called a chassis, which houses several internal components, and the external components, including peripherals.
Inside the case go the following internal parts:

• Power Supply/PSU – power supply unit, converts outlet power, which is alternating current (AC), to direct current (DC), which is what the internal components require, as well as providing appropriate voltages and currents for the various internal components.
• Motherboard/mainboard – As the name indicates, this is the electronic centerpiece of the computer, everything else connects to the motherboard.
• Processor/CPU – central processing unit, the "brain" of the computer, most actual computation takes place here.
• RAM – random access memory, the "short-term memory" of a computer, used by the CPU to store program instructions and data upon which it is currently operating. Data in RAM is lost when the computer is powered off, thus necessitating a hard drive.
• Hard Drive/Hard Disk – the "long-term memory" of the computer, used for persistent storage – i.e. the things stored on it remain even when the computer is powered down. The operating system, and all your programs and data are stored here.
• Optical Drive – device for reading/writing optical disks. May read CDs, DVDs, or other optical media, depending on the type. It is essential for installing many operating systems and programs. It may be able to write some of these discs, as well. Some people like to have two such drives for copying disks. 
• Video Card/Graphics Card/GPU – does processing relating to video output. Some motherboards have an "onboard" GPU built in so you don’t need (but may add) a separate video card. Otherwise, you will need a video card. These plug into a slot on the motherboard and provide a place to connect a monitor to your computer.
• Keyboard – for typing on. Many motherboards won't even boot without a keyboard attached.
• Mouse – for pointing and clicking. Unless you chose a text-based operating system, you will likely want one of these.
• Monitor – This is where the pretty pictures go. They come in many forms, the most common being CRT and LCD.