# file extension

> English word · Noun

## Definitions
1. A short series of text characters at the end of a computer filename, used to indicate the type of contents and the software that will be required to operate or open it.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/file-extension