An instruction is a form of communicated Information that is both command and explanation for how an action (philosophy), behavior, method, or task is to be begun, completed, conducted, or executed.

= Computing =

In computer science, an instruction typically refers to a single operation of a processor within a computer architecture. The types of instruction allowed are defined and determined within the particular platform s instruction set architecture (ISA), which also determines Processor_register sources and destination operands, and perhaps an immediate field. Machine instructions are numbers represented in binary numeral system. A portion (field) of the instruction designates the operation to be done and is called an opcode; since the numeric value of this is not very meaningful to humans, a corresponding short abbreviation is used by programmers. The size, or width of an instruction depends on the architecture of the Platform (computing), but it is usually from 4 to 64 Bits wide. The following is an example of a x86 instruction in symbolic Assembler notation:

:SHL   AX, 01

SHL is called the Operator (programming), and AX, 01 are called Operands. AX is the name of a register, 01 is a Variable#constant. In this example, SHL is a mnemonic abbreviation for shift left . The instruction causes the value in AX to be shifted left by 01 bit postition.

=French law=

In the context of France law (or inquisitorial systems based on France s), the instruction is the pre-trial phase of a criminal investigation that is led by a judge. More generally, it refers to phases of judicial or administrative proceedings where a request is investigated, and information pertaining to it is collected, before a final decision is made.

=Music=

Instruction is the name of a and Garrison.

=See also=