Core Web Vitals are a set of metrics defined by Google to measure a website’s user experience. Key metrics include Largest Contentful Paint (LCP), First Input Delay (FID), and Cumulative Layout Shift (CLS), which assess load speed, interactivity, and visual stability.

Optimizing Core Web Vitals improves website performance, enhancing ad visibility and user engagement. For advertisers, better Core Web Vitals scores lead to higher search rankings and a smoother experience for users, which can improve ad effectiveness.