Instruction set architecture is distinguished from microarchitecture. Microarchitecture is the detailed description of the system that is enough for completely describing the operation of all parts of the computing system, as well as how they are inter-connected and inter-operate to implement the ISA. An instruction set is the part of the computer architecture related to programming. An ISA includes a specification set of opcodes (machine language), which are the native commands implemented in a particular central processing unit design.