Largest Contentful Paint (LCP) is a performance metric that measures the time it takes for the largest visible content element on a webpage to load, such as an image or block of text. An optimal LCP occurs within 2.5 seconds of page load, indicating a good user experience.

Improving LCP involves optimizing server response times, resource loading, and implementing efficient image formats and sizes. Monitoring and enhancing LCP is crucial for maintaining user engagement and achieving favorable search engine rankings.