Navboost is an internal Google system that adjusts search rankings based on aggregated user interaction signals — most notably clicks, long clicks (visits where the user stays on the page), and dwell time collected from Google Search and Chrome. Documents confirmed during the 2024 US Department of Justice antitrust trial revealed Navboost as a significant ranking component, storing up to 13 months of click data per query-URL pair and using it to promote results that consistently satisfy searchers. Navboost is query-specific, meaning a page can receive a boost for one query phrase while remaining unaffected for another. The disclosure confirmed long-standing SEO speculation that click-through rate and user engagement influence rankings, though Google has historically downplayed this publicly.