Galaxy Themes is a decorative content service offered by Samsung that allows users to easily apply a design downloaded from Galaxy Themes or Galaxy Store on their device. The service includes wallpapers, icons, call and message interfaces, and other design elements that are integrated in a way that feels natural and organic. Galaxy Themes is supported on Samsung mobile devices, Galaxy S6 or later, with HD or higher resolution. To apply a theme from the Galaxy Themes store, users can long-press on their Galaxy devices home screen, tap the "Themes" icon, select an item, tap "Download," and then tap "Apply". Themes that have already been downloaded to the device can be applied by tapping the devices settings icon, tapping "Themes," tapping the "Menu" icon, tapping "My stuff," selecting the theme to apply, and then tapping on the "Apply" option. Galaxy Themes are also available from Galaxy Store.

In summary, Galaxy Themes is a service that allows Samsung users to customize the look of their device with a variety of design elements. It is easy to use and offers a range of options for users to express their personality.