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1. CISC : It is acronym for Complex Instruction Set computing. The CISC architecture contains a large set of computer instructions that range from very simple to very complex and specialized.
2. RISC : It is acronym for Reduced Instructions Set Computing. It has relatively limited number of instructions. It is designed to perform relatively small number of operations so that it can operate at higher speed.
3. EPIC : It is acronym for Explicitly Parallel
Instruction Computing. It refers to architecture in which features are provided to facilitate compiler enhancements of Instruction Level Parallelism in all programs while keeping hardware complexity relatively low.