This tutorial demonstrates how to use LaunchDarkly's feature flags in a JavaScript application. It guides users through setting up a fan page project and creating a feature flag named "style-update" that switches between styles of the webpage. The process includes installing necessary dependencies, initializing the LaunchDarkly client, and checking the value of the style-update flag to display different versions of the fan page based on its state. By using feature flags, developers can safely implement new features or styles and instantly roll back changes if something goes wrong, minimizing risk and keeping users happy.