Spotify’s feature that automatically adds recommended songs to a playlist is Enhance. Spotify introduced Enhance in 2021 as a Premium feature that suggests tracks matching the songs already in a user-created playlist.
When enabled, Enhance inserts recommended tracks among the playlist’s existing songs. These suggestions are personalized using Spotify’s recommendation systems and can be accepted permanently or removed. The original playlist remains under the listener’s control, so the feature is designed for discovery rather than replacing the user’s selections.
A common mix-up is Smart Shuffle, which Spotify introduced later. Smart Shuffle also recommends music, but it is intended to blend suggestions into playback and can work with playlists, albums, or artist pages. Spotify described Smart Shuffle as building on Enhance’s recommendation technology. Enhance is therefore the historically precise name for the playlist feature in this question.