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Miloslav Ciz 2022-01-14 20:30:20 -06:00
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# Computer
The word *computer* can be defined in many ways and can also take many different meanings; a somewhat common definition may be this: computer is a machine that automatically performs mathematical computations. We can also see it as a machine for processing information or, very generally, as any tool that helps computation, in which case one's fingers or even a [mathematical](math.md) formula itself can be considered a computer. Here we are of course mostly concerned with electronic [digital](digital.md) computers.
We can divide computers based on many attributes, e.g.:
- by **representation of data**: [digital](digital.md) vs [analog](analog.md)
- by **[hardware](hw.md) technology**: [electronic](electronics.md), [mechanical](mechanical.md), biological etc.
- by **purpose**: special purpose vs general purpose, [personal](pc.md), [embedded](embedded.md), [supercomputers](supercomputer.md) etc.
- by **[programmability](programming.md)**: non-programmable, partially or fully programmable
- by **other criteria**: conventional vs [quantum computers](quantum.md) etc.