RISC - (Pronounced "risk") - (Reduced Instruction Set Computer) - A Reduced Instruction Set Computer is a type of microprocessor that recognizes only a limited number of instructions.  It's the opposite of the standard PC which is CISC (Complex Instruction Set Computer). RISC computers can execute their instructions very fast because the instructions are so simple. Also RISC chips as easier to make (as they require fewer transistors.) There are set-top boxes and other interactive TV related hardware that use RISCs.