Definition
A unit of digital information consisting of eight bits, used as the standard building block for representing data — such as a single character, number, or instruction — in computer and avionics systems.
Plain English
A small chunk of computer data made up of eight on/off signals. One byte is enough to store one letter or one small number.
Context Anchor
Seen in discussions of aircraft electronic systems, software updates, stored data, and digital communication between equipment.
Derivation
Coined in the 1950s by computer engineers as a deliberate respelling of 'bite' — a small piece taken at once — to avoid confusion with 'bit'. The 'y' was used to keep the two terms visually distinct.
Why Pilots Care
Modern cockpits depend on digital systems. Knowing that data sizes (kilobytes, megabytes, gigabytes) are built from bytes helps pilots understand database update sizes, memory capacity of flight equipment, and storage limits on EFBs and avionics.
Analogy
Think of a byte as one small slot in computer storage. Each slot can hold a tiny piece of information, such as one letter or part of a number.
Intuition Check
Do not read “byte” as the ordinary word “bite.” In aviation electronics, a byte is a small unit of digital information, not a physical action or mark.
Example Sentence 1
The navigation database update was about 200 megabytes, which is roughly 200 million bytes of data loaded into the GPS.
Example Sentence 2
Each waypoint message sent over the data link contained 128 bytes of position and altitude information.