The update, which affected pages that offer recommendations, opinions or analysis on products, services, destinations, games, movies, and other items, was significant, with several publishers reportedly impacted.
While the update focused on reviews, it may be necessary for sites affected by it to assess their content and methodologies to see if something else could be the cause of the drops in traffic.
Google's official guidance suggests that the reviews system evaluates articles, blog posts, pages, or similar first-party standalone content written to provide a recommendation, opinion, or analysis.
The algorithm emphasizes in-depth research and original analysis as signals of expertise, and reviews should be based on real evaluations of the services, products, or things being reviewed.