A Google algorithm update refers to a change or modification made to the complex set of rules and calculations used by the search engine to determine the ranking of websites in its search results. These updates are constantly being implemented by Google in order to improve the accuracy and relevance of its search results for users. They can have a significant impact on the visibility and traffic of websites, as they can either boost or decrease their ranking. Google algorithm updates are often shrouded in secrecy and are closely monitored by website owners and digital marketers in order to adapt their strategies and maintain a strong online presence.