What is instruction? - Definition from WhatIs.com
Part of the Computing fundamentals glossary:

An instruction is an order given to a computer processor by a computer program. At the lowest level, each instruction is a sequence of 0s and 1s that describes a physical operation the computer is to perform (such as "Add") and, depending on the particular instruction type, the specification of special storage areas called registers that may contain data to be used in carrying out the instruction, or the location in computer memory of data.

In a computer's assembler language, each language statement generally corresponds to a single processor instruction. In high-level languages, a language statement generally results (after program compilation) in multiple processor instructions.

In assembler language, a macro instruction is one that, during processing by the assembler program, expands to become multiple instructions (based on a previously coded macro definition).

This was last updated in September 2005
Posted by: Margaret Rouse

Related Terms

Definitions

  • JBoss

    - JBoss is a division of Red Hat that provides support for the JBoss open source application server program and related middleware services marketed under the JBoss Enterprise Middleware brand. (WhatIs.com)

  • GPU supercomputer

    - A GPU supercomputer is a networked group of computers with multiple graphics processing units working as general-purpose GPUs (GPGPUs) in tandem on a single task. (WhatIs.com)

  • video card (graphics card)

    - A video adapter (alternate terms include graphics card, display adapter, video card, video board and almost any combination of the words in these terms) is an integrated circuit card in a computer ... (WhatIs.com)

Glossaries

  • Computing fundamentals

    - Terms related to computer fundamentals, including computer hardware definitions and words and phrases about software, operating systems, peripherals and troubleshooting.

  • Internet applications

    - This WhatIs.com glossary contains terms related to Internet applications, including definitions about Software as a Service (SaaS) delivery models and words and phrases about web sites, e-commerce ...

Tech TalkComment

Share
Comments

    Results

    Contribute to the conversation

    All fields are required. Comments will appear at the bottom of the article.