Machine instruction refers to the set of operations that a computer performs to execute a particular task. In computing, there are a variety of synonymous terms that refer to machine instruction, each with their own nuances. These terms include assembly language, mnemonics, opcodes, commands, and directives. Assembly language refers to a low-level programming language consisting of mnemonics used to represent machine instructions. Opcodes or operation codes, on the other hand, are the numerical codes assigned to each machine instruction. Commands are higher-level instructions used to execute more complex tasks, while directives provide instructions to the assembler or compiler. Regardless of the term used, machine instructions are the fundamental building blocks of computer programs.