Zilan: The computer that we've built is constructed from relays, wires, switches, and lightbulbs. All of these things are "hardware". In contrast, the instructions and other numbers that we enter into memory are called "software". It's "soft" because it can be changed much more easily than the hardware can. Generally, in computer programs, we can distinguish between code (which refers to the instructions themselves) and data, which are the numbers that the code manipulates.

The computer that we've built is constructed from relays, wires, switches, and lightbulbs. All of these things are "hardware". In contrast, the instructions and other numbers that we enter into memory are called "software". It's "soft" because it can be changed much more easily than the hardware can. Generally, in computer programs, we can distinguish between code (which refers to the instructions themselves) and data, which are the numbers that the code manipulates.

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Code Charles Petzold

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