instruction what is
Definition of Instruction Set for programmer: architecture (ISA), is the part of the computer.

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Definition Instruction Set

Explanation: An instruction set, also known as instruction set architecture (ISA), is the part of the computer architecture related to programming, including the native data types, instructions, registers, addressing modes, memory architecture, interrupt and exception handling, and external I/O. An ISA includes a specification of the set of opcodes (machine language), the native commands implemented by a particular CPU design.

Other definitions in programming such as Instruction Set in Dictionary I.