Core Web Vitals are a set of specific factors that Google considers important in a webpage’s overall user experience. Core Web Vitals are made up of three specific page speed and user interaction measurements: Largest Contentful Paint, First input Delay, and Cumulative Layout Shift. web.dev/#core-web-vitals
In short, Core Web Vitals are a subset of factors that will be part of Google’s “page experience” score (basically, Google’s way of sizing up your page’s overall UX).
It is not mentioned in the link above, but server speed, and how long it takes to deliver files, plays a big part on this measurement.
| CORE WEB VITALS
|| OTHER WEB VITALS |
Largest Contentful Paint (LCP)
First Input Delay (FID)
Comulative Layout Shift (CLS)
||NO INTRUSIVE INTERSTITIALS|
Core Web Vitals can be tested using Google's Pagespeed Insights, and Search Console's Core Web Vitals report. Pagespeed Insights will also give you a full detailed section of things you could do to improve this score.