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I think you mean 'CISC' and 'RISC'. These refer to two ways of designing an instruction set for a computers processor or CPU. CISC is Complex Instruction Set Computer. This is how computers all used to be designed. The chip designer added an instruciton to the CPU for pretty much anything that they thought would be useful. This produced a complex chip. Early chips like Intel 8088/86 and Motorola 68000 were designed in this way.

RISC stands for Reduced Instruction Set Computer. On these chips, the instruction set is paired down to the absolute minimum needed, and complex operations are performed with multiple instructions. This simplifies the chip design and makes it easier to design a chip which runs at faster clock speeds (Mhz or GHz) and with lower power consumption. It also makes it easier for the compiler to optimise it's output, in most cases. Examples of RISCs are the ARM family and the MIPS family.

Nowadays it's difficult to put many CPUs firmly in one or the other category, because they contain elements of both philosophies.

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