Ranking Factor is a signal, system, or consideration that may influence how search engines order results.
It matters because organic search compounds over time when pages are technically accessible, useful, differentiated, and connected to real search intent. Clear SEO terminology also helps teams avoid shortcuts that create long-term risk.
Example
When investigating a ranking change, a team may review content relevance, crawl access and other documented considerations. Correlation with a recent site edit does not establish that the edit was the sole ranking factor responsible.