A core update is a substantial modification to Google’s ranking algorithm designed to enhance the overall quality and relevance of search results by fundamentally reshuffling the rankings of indexed pages.
Every core update involves a refinement of Google’s ranking formula and can significantly impact a large number of websites. Pages that previously ranked highly for specific keywords may see their rankings fall following the deployment of a core update.
Core algorithm updates are typically released every few months. Google usually provides advance notice of upcoming updates and outlines their intended objectives.
Core updates are distinct from minor updates. A minor update might only affect a small fraction of search results, whereas a core update has the potential to influence a far greater percentage of the results landscape.
Furthermore, core updates may require several weeks to fully propagate and take effect. In contrast, minor updates are sometimes implemented on a daily basis.