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Abbreviation of central processing unit, and pronounced as separate letters. The CPU is the brains of the computer. Sometimes referred to simply as the processor or central processor, the CPU is where most calculations take place. In terms of computing power, the CPU is the most important element of a computer system

What does a CPU do?

As the brains of your computer, a CPU pretty much runs the whole show. It allows you to:

Operate software. The more powerful your CPU, the more kinds of applications you'll be able to run on your system. Software packaging always tells you the minimum amount of processing power you'll need to use that program. If you don't have enough power in your CPU, the software will run slowly or improperly.
Speed your computer's operation. A top-of-the-line CPU will perform tasks more quickly than an older processor. The difference in speed can be astonishing, especially when doing jobs that require heavy number crunching.
Do high-end design work. If you are working with graphics or computer-assisted design, a modern, powerful CPU is essential to manipulate the massive amounts of information found in complex and memory-intensive graphics.
Stay ahead of software design. Software development typically has lagged behind processing power. So it usually takes a while before popular software starts to demand more power than CPUs can deliver. Software developers have traditionally stayed behind this curve because they want to sell products that can be used on older machines. But so many new PCs are being sold every year that developers increasingly are able to make a profit on titles that require heavy-duty CPUs.

What does the CPU actually do?

All the CPU does is run programs by fetching instructions from RAM, evaluating them, and executing them in sequence. The instructions are numbers of the binary system, in a special format that is unique for each machine. The CPU breaks an instruction into parts to see if it has to do something. For instance, a '1' in a certain position in an instruction could mean that the CPU would have to load data in from RAM, or that it would have to add two numbers. After the CPU determines what an instruction is supposed to do, it tells its component parts what to do to complete the instruction. The parts of a CPU include the ALU, Registers, and the Control Store. There is more technical information as your read on.

Installing a cpu is a simple process but takes lots of precise actions !

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