Instruction
An
instruction is a form of
information which is
communicated in order to explain how an
action,
behavior,
method, or
task is to be begun, completed, conducted, or executed.
Computer architecture
\nIn Computer architecture, an instruction is a single operation of a processor. The width of an instruction depends on the architecture of the platform, but it is usually from 4 to 64 bits wide. The content of an instruction is determined by the platform's Instruction Set Architecture (ISA), but it usually contains an opcode, which determines the type of instruction, register sources and destination operands, and maybe an immediate field.
Computer science
\nAt a higher level, in computer science, an instruction could also be part of a computer program in a programming language; see also Procedure.
French law
\nIn the context of French 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.
