Digital & Data

Bit and Byte

Definition

A bit is the smallest unit of digital information, representing a 0 or 1; a byte is a group of 8 bits, capable of representing 256 distinct values.

Explanation

Network speeds are quoted in bits per second (Mbps, Gbps), while file sizes use bytes (MB, GB)—a frequent source of confusion. A 100 Mbps internet connection transfers 100 megabits, or about 12.5 megabytes, per second. ASCII encodes each English character in 1 byte; a UTF-8 emoji typically requires 4 bytes. The 8-bit byte became standard in the 1960s with the IBM System/360.

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RELATED TERMS

Binary Prefix

Binary prefixes (KiB, MiB, GiB) denote powers of 1024, in contrast to metric SI prefixes (KB, MB, GB) which denote powers of 1000.

Bandwidth

Bandwidth is the maximum data transfer capacity of a communication channel, typically measured in bits per second (bps, Mbps, Gbps).

Latency

Latency is the time delay between a data packet being sent from a source and received at its destination, typically measured in milliseconds (ms).

Throughput

Throughput is the actual rate at which data is successfully transferred over a network or system in a given time period, measured in bits or bytes per second.

Clock Speed

Clock speed is the frequency at which a processor executes cycles, measured in hertz (Hz), with modern CPUs operating in the gigahertz (GHz) range.