Micro-Operation (Micro-Ops or µOP) is a simple internal representation of an architectural instruction as handled by the microprocessor. While exact definition of µOPs varies across implementations it is generally associated with designs that transform more complex (e.g. variable length or multiple operations) instructions with simple single-operation commands. Generally, Micro-Operations are a result of cracking Macro-Operations. It's a common misconception that micro-operations are exclusively a CISC concept. While more often associated with CISC ISAs such as x86 and z/Architecture, micro-ops are also used in various RISC designs such as ARM and POWER.