What is complex CPU?

A complex CPU, or complex instruction set computer (CISC), refers to a type of microprocessor architecture that is designed to execute a large number of instructions, including complex ones, in a single machine cycle. This architecture allows for more powerful and versatile operation by supporting a wide range of addressing modes and instructions, which can simplify programming and reduce the number of instructions needed for certain tasks. However, it often results in longer execution times and increased design complexity compared to simpler architectures like RISC (Reduced Instruction Set Computer).