Technical Definition
CrUX is Google's dataset of real user experience metrics from Chrome users who opt in. Powers field data in PageSpeed Insights and Search Console. Provides origin-level and URL-level Core Web Vitals data. 28-day rolling average. Represents actual user experience, not lab simulations. Available via BigQuery and API.
Simple Explanation (ELI13)
CrUX is Google's database of real user experience data from Chrome users. It shows how actual visitors experience your site, not just test results. PageSpeed Insights uses CrUX data to show 'field data.' If your site gets enough traffic, you'll see real user Core Web Vitals scores from CrUX.
Related Terms
Core Web Vitals, Field Data, PageSpeed Insights, Real User Monitoring
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