# 404 Not Found

##### Summary

This glossary contains definitions of technical and marketing terms referenced across DAO.AD documentation.

##### Definition

A 404 is another type of HTTP status code. It’s delivered by a server when a requested file or page has been deleted or never existed in the first place. Depending on the 404, it may be appropriate to 301 redirect this URL to an equivalent or close-variant URL.

##### Used in

- [Statistics API](https://wiki.dao.ad/books/api-docs/page/statistics-api "Statistics API")
- [Campaign Management API](https://wiki.dao.ad/books/api-docs/page/campaign-management-api "Campaign Management API")

##### Last Updated

2026-07-05 · Owner: wiki@dao.ad