Core web vitals are the metrics that search engines use to measure the user experience of the website. It focuses on how soon the website or the content on the website loads, how interactive the site is, and how soon the page layout loads.
There are three main types of core web vitals:
LCP or Largest Contentful Paint tracks the loading performance of the site - specifically the image or the text that appears on the screen.
FID, or First Input Delay, measures the time between a visitor’s first interaction, such as clicking a CTA, and the moment the browser can respond. Since March 2024, Google uses INP (Interaction to Next Paint) instead of FID.
CLS, or Cumulative Layout Shift, measures how much the page elements move unexpectedly while the page loads.
The core web vitals are important to improve the user experience on the website and they help the page to rank higher on the search engine.