Core Web Vitals are Google's three official page experience metrics: Largest Contentful Paint (LCP - target under 2.5 seconds), Interaction to Next Paint (INP - target under 200ms), and Cumulative Layout Shift (CLS - target under 0.1). Pages marked 'Poor' on any metric can be outranked by competitors with equivalent content but better technical performance. For Indian websites on shared hosting or unoptimised WordPress, LCP is almost always the primary issue. Core Web Vitals remediation is typically handled as part of a website maintenance and development engagement since it requires server-level, code-level, and plugin-level changes.