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Each byte represents a number. What that number means, will depend on where abouts it is, in a memory location or program.

For example.

In the graphics area of memory, the number will determine what color the pixel should be for that location. There will be a byte for every pixel.

A pair of bytes will represent where the computer should look in the memory to retreive another number.

A single byte will represent a command, when executed by the CPU. A program is operated on, one byte at a time in sequence, unless the operation code (another byte) tells it to jump to another part of the program or stop.

A CPU has a look up table, where each number (represented by a byte) will have an operation. This operation could be, to just add 1 to the number in the present registry.

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