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Software is a set of instructions that tell the computer what to do, and individual computer instructions can be put together in different ways to cause a computer to perform the tasks that the programmer(s) wish to accomplish.

Computer instructions are extremely simple. Individual computer instructions consist of extremely basic commands, such as:

"add the content of register 1 to the content of register 2 and put the results in register 1"

"If the content of register 1 is greater than the content of register 2 continue processing at the location stored in register 3, otherwise continue processing at the at the next memory location"

Different processor types have different instruction sets, requiring that software be customized before it can run on different "platforms" (PC, Apple, Cray...)

Software can be loaded into a computer from many sources, such as disks, memory sticks, internet, to name a few.

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7y ago

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