Glossary
Common Crawl
Last reviewed: 2026-05-12
Common Crawl is a non-profit project that publishes a free monthly crawl of the public web. The resulting corpus seeds the training data of most large language models. CCBot inclusion is a foundational prerequisite for training-corpus recall.
Frequently asked
- What is Common Crawl?
- Common Crawl is a non-profit project that publishes a free monthly crawl of the public web. The resulting corpus seeds the training data of most large language models, including GPT, Claude, Gemini, and most open-source models.
- Why does Common Crawl matter for AEO?
- If your domain is not in Common Crawl, it is effectively invisible to the training-corpus recall layer of every major LLM. CCBot inclusion is a foundational prerequisite for being cited.
- How do I verify my site is in Common Crawl?
- Query cdx.commoncrawl.org for your domain to see whether and when it has been crawled. Allow CCBot in robots.txt and check inclusion in the next monthly snapshot.