ThemeBuilder is a versatile tool that helps you create visual styles and apply them to the Telerik and Kendo UI web components. To help achieve a unique appearance for your apps, ThemeBuilder offers an intuitive UI where you can experiment with colors and properties like border-radius and typography. ThemeBuilder allows you to visualize the styles that you create and see how they change the look of the UI components. With the ThemeBuilder advanced customization, you can change virtually every appearance-related property of the UI components until you achieve the desired style. The final result of using ThemeBuilder is a vibrant theme packed as an npm package that contains your ready-to-use Sass and CSS. ThemeBuilder allows you not only to create themes for your new apps but also to maintain and update the styles of your existing apps - whenever you decide to change the styling in your app, open your existing ThemeBuilder project, make the changes, and apply them to the UI components.