Reduced Instruction SetEach processor or processor family has a specific set of instructions that it can execute. This is called the instruction set, or sometimes the instruction-set architecture (ISA). Computer; a kind of processorA computer chip that does computing work for a computer. It may do general work (like in your home computer) or it may do specialized work (like some of the processors in your smartphone). that has far fewer instructions than a CISCComplex Instruction Set Computer; a kind of processor architecture that may have many, many instructions that are complicated and specialized. This term contrasts with RISC. processor. It can still do the same things, but it may require the use of multiple simpler instructions instead of one complicated instruction.