Web Vitals is Google's broader initiative to provide unified guidance on the quality signals that matter for a healthy site, of which Core Web Vitals are the headline subset. Where Core Web Vitals are the three metrics tied to ranking (LCP, INP, and CLS), Web Vitals is the wider family of supporting measurements Google offers for diagnosing user experience.
The supporting metrics include Time to First Byte (TTFB) and First Contentful Paint (FCP), which help explain loading behavior, and Total Blocking Time (TBT), a lab metric that correlates with the responsiveness that INP captures in the field. These are not direct ranking factors, but they are the diagnostic layer beneath the Core trio.
The distinction matters in practice: you optimize the Core Web Vitals because they affect ranking and user experience, and you measure the wider Web Vitals to find out why a Core metric is failing. A poor LCP, for instance, is often diagnosed by examining TTFB and FCP first.
This is a short definition. For thresholds and the field-versus-lab picture, use the deep guides.
Related: field vs lab (CrUX), Core Web Vitals, TTFB
Claude Vincent is a technical SEO consultant focused on crawlability, rendering, and AI-search visibility. He writes the field guides and case studies at SEO ProCheck, with a bias toward the durable, unglamorous work that decides whether search engines and AI answer engines can actually read and cite a site.
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