# Canonical Tag/Rel=Canonical

##### Summary

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

##### Definition

A canonical is an HTML attribute that refers to a site owner’s preferred or master version of a web page. Using a canonical tag helps to consolidate duplicate issues in a search engine’s index if the content is the same or similar across multiple pages. Canonical tags can be honoured or ignored by search engines depending on the reason they’re used.

##### 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