Known as Google Core Web Vitals, this is a set of three key experience that Google began using in June 2021 to measure website quality in the following areas:

• Performance: Largest Contentful Paint (LCP)
• Interactivity: First Input Delay (FID)
• Stability: Cumulative Layout Shift (CLS)

Web Vitals Initiative

Core Web Vitals are a subset of Web Vitals.

Web Vitals is a Google initiative to provide unified guidance on essential quality signals for delivering an optimal user experience on the web.

CWV applies to all web pages, must be measured by all website owners, and will be displayed in all Google tools.

Each of its items represents a distinct facet of the user experience, is measurable through real user data on the field ), and reflects the real-world experience of a critical user-centric outcome.

The metrics that make up Core Web Vitals will evolve over time.