Interaction to Next Paint (INP) is a web performance metric that measures how quickly a webpage responds after you click or tap something. A lower INP means the page reacts faster, making for a better user experience and keeping people engaged. If it’s high, it can lead to frustration and users leaving the site. Improving INP helps not only with user satisfaction but also boosts your site’s search ranking by aligning with Google’s focus on fast and interactive web experiences.