Fully Loaded Time refers to the total time it takes for a web page to fully load and become interactive for users. This includes the time taken to download all elements such as images, scripts, and stylesheets, as well as the time needed for the browser to render the page. Measuring Fully Loaded Time is important for website performance, as it impacts user experience and engagement. A faster loading time can lead to lower bounce rates and higher conversion rates, making it a key factor for website owners and developers to optimize.