What is most significant bit or byte? - Definition from WhatIs.com

Definition

most significant bit or byte

Part of the Computing fundamentals glossary:

The most significant bit (MSB) is the bit in a multiple-bit binary number with the largest value. This is usually the bit farthest to the left, or the bit transmitted first in a sequence. For example, in the binary number 1000, the MSB is 1, and in the binary number 0111, the MSB is 0.

The most significant byte, also abbreviated MSB, is the byte in a multiple-byte word with the largest value. As with bits, the MSB (byte) is normally the byte farthest to the left, or the byte transmitted first in a sequence.

When the MSB in a sequence is farthest to the left (or first), the least significant bit or byte (LSB) is usually the one farthest to the right (or last). In this case, the sequence is said to be big-endian . If the order is reversed so the MSB is farthest to the right (or last) and the LSB is farthest to the left (or first), the sequence is said to be little-endian .

Under certain circumstances, binary numbers or words may be neither little-endian nor big-endian. In encrypted data, for example, the bit or byte significance can be scrambled, in which case the MSB or LSB can appear anywhere in the sequence.

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

Related Terms

Definitions

  • unique identifier (UID)

    - A unique identifier (UID) is a numeric or alphanumeric string that is associated with a single entity within a given system. (WhatIs.com)

  • cache memory

    - Cache memory, also called CPU memory, is random access memory (RAM) that a computer microprocessor can access more quickly than it can access regular RAM. (SearchStorage.com)

  • service-oriented architecture (SOA)

    - Service oriented architecture (SOA) is a technique that involves the interaction between loosely coupled services that function independently. (SearchSOA.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 ...

Ask a Question. Find an Answer.Powered by ITKnowledgeExchange.com

Ask An IT Question

Get answers from your peers on your most technical challenges

Ask Question

Tech TalkComment

Share
Comments

    Results

    Contribute to the conversation

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