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The Central Processing Unit (CPU), is known as the brain of the computer. It is the primary component responsible for the actual computing that goes on within a computer. It uses a binary language of 1's and 0's in sequence to represent different values, which in cooperation with each other correspond to everything from pixels on the monitor, to breaking down and reading the code of the programs you run.

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The CPU has two parts, the control unit and the logic unit. The control unit uses electrical signals to communicate with other components of the computer, specifically the memory, and uses it in tandem with the arithmetic/logic unit in order to perform tasks. The arithmetic/logic unit is what does the number crunching. It can perform what is called logic, and the four basic mathematical operations, multiplication, division, addition, and subtraction. Logic is most often used to compare two values. It can compare number values, or representative data (such as letters and special characters in binary).

This ability to compare numbers is crucial to the computers functionality, and is most often used to compare two numeric values. This is how a computer can tell if there are still movie tickets left, or if you'll be able to afford what you're purchasing. It can compare things in three ways, equal to, less than, or greater than. The CPU accomplishes all these things using the electronic components inside it. CPU's are what's known as an integrated circuit. They contain transistors which have two states, on or off, that can change due to electrons moving from two sides of the P/N junction made of silicon, giving us our two binary values, on or off, yes or no, one or zero.

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There are millions of these transistors in the CPU and they all hold a value of either one or zero which in sets of 8, called bytes, represents anything from a letter, special character, or a number. For example a value such as a color range of RGB that corresponds to pixels on the screen to create what you see on the monitor. The control unit uses a similar process with transistors but sends data to other parts of the computer, specifically the RAM which it works closely with to accomplish its goals.

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