Units of information

The bit is the most basic unit of information in computing and digital communication. The name is a portmanteau of binary digit. The bit represents a logical state with one of two possible values. These values are most commonly represented as , but other representations such as true/false, yes/no, on/off, and +/− are also widely used.

The byte is a unit of digital information that most commonly consists of eight bits. Historically, the byte was the number of bits used to encode a single character of text in a computer and for this reason it is the smallest addressable unit of memory in many computer architectures. To disambiguate arbitrarily sized bytes from the common 8-bit definition, network protocol documents such as the Internet Protocol () refer to an 8-bit byte as an octet.

The megabyte is a multiple of the unit byte for digital information. Its recommended unit symbol is MB. The unit prefix mega is a multiplier of (106) in the International System of Units (SI). Therefore, one megabyte is one million bytes of information. This definition has been incorporated into the International System of Quantities.

thumb|Board of the Tangerine Microtan 65, featuring 1024 bytes of RAM. First sold in 1979.

The gigabyte () is a multiple of the unit byte for digital information. The prefix giga means 109 in the International System of Units (SI). Therefore, one gigabyte is one billion bytes. The unit symbol for the gigabyte is GB.

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thumb|upright=0.6|The general definition of a qubit as the quantum state of a two-Energy level|level quantum system In quantum computing, a qubit () or quantum bit is a basic unit of quantum information; a binary qudit the quantum version of the classic binary bit physically realized with a two-state device. A qubit is a two-state (or two-level) quantum-mechanical system, one of the simplest quantum systems displaying the peculiarity of quantum mechanics. Examples include the spin of the electron in which the two levels can be taken as spin up and spin down; or the polarization of a single pho

REDIRECT Byte#Multiple-byte units

formatted unit of data carried by all packet-switching networks

REDIRECT Byte#Multiple-byte units

base memory unit handled by a computer

REDIRECT Byte#Multiple-byte units

symbol placed before units of digital information to indicate multiplication by a power of two

REDIRECT Byte#Multiple-byte units

192px|thumb|right|An Octet (computing)|octet [[code page 866 font table ordered by nibbles.]]

unit of digital information

data transmission unit

A datagram is a basic transfer unit associated with a packet-switched network. Datagrams are typically structured in header and payload sections. Datagrams provide a connectionless communication service across a packet-switched network. The delivery, arrival time, and order of arrival of datagrams need not be guaranteed by the network.

capacity of information storage and communication

logical or physical division of data storage media

logarithmic unit of information

unit of information

A qutrit (or quantum trit) is a unit of quantum information that is realized by a 3-level quantum system (qudit with radix 3), that may be in a superposition of three mutually orthogonal quantum states.

unit of information; log₂(10) bits

type of unit of measurement

IEEE standard