Apple Music allows users to mark the songs they like with a star button (previously marked with a heart icon). If you have starred a bunch of songs from the app and want to play them on your iPhone, the following post will help you find your favorite songs and create a playlist with all the songs you have marked as favorite in Apple Music.
How to Add and Find Favorites in Apple Music on Your iPhone
Related: How to Become a Star in Apple Music
Instead, the star icon is used to let the service know which songs, albums, playlists, and artists you like. Future suggestions shown to you will now be curated based on your favorites. Depending on the type of media you like, the starred items will appear in different categories, such as songs, albums, playlists, and artists.
Related: How to Prevent Favorite Songs and Playlist Songs from Being Added to Your Library in Apple Music