Field Data (Real User Monitoring - RUM)

Field data is performance data collected from the real users visiting your website in their actual environments. It captures the true user experience across the full spectrum of devices, network conditions, and geographic locations. It is often called Real User Monitoring (RUM). Unlike Lab Data, which is simulated, field data is the source of truth for how your website performs for your actual audience and is what Google uses for its Core Web Vitals ranking signal.