What is "Core Web Vitals"?

Core Web Vitals is a set of key Google metrics that measure the quality of user experience on a site: how fast the main content loads, how responsive the page is, and how stable the layout behaves during loading. These metrics are an official ranking factor, so they directly affect SEO.

#The set includes three metrics

1. LCP (Largest Contentful Paint) - the speed at which the largest, most significant element appears on screen (an image, a banner, a heading). It captures the sense of "how fast the page visually loaded".
2. INP (Interaction to Next Paint) - a generalized responsiveness metric (it replaced FID). It shows how fast the site reacts to the first interaction: a click, a tap, input. It matters for the feeling that "the site is alive and not lagging".
3. CLS (Cumulative Layout Shift) - layout stability. It measures whether elements "jump" during loading (for example, when a button shifts and the user accidentally taps the wrong spot).

The purpose of Core Web Vitals is to give search engines a single universal standard for measuring a site's real usability through the user's eyes, not just technical parameters.