PageSpeed refers to the measurement of how quickly the content on a web page loads and becomes interactive for users. It is a critical factor in user experience, search engine optimization (SEO), and overall website performance. PageSpeed is influenced by various elements, including server response time, image optimization, code efficiency, and the use of caching. Faster page speeds can lead to higher user engagement, improved search rankings, and better conversion rates. Tools like Google PageSpeed Insights are commonly used to analyze and optimize website loading times.