---
tag: 0Q4CBD3HX0
kind: concept
name: Domain
aliases: [domain-of-a-function]
msc: ["03E20"]
sources:
  - url: https://en.wikipedia.org/wiki/Domain_of_a_function
    locator: lead section
same_as:
  wikidata: Q192439
  wikipedia: Domain of a function
---

## Summary

The domain of a function is the set of its inputs.