Other forms: legatos
If you see the word legato in your sheet music, it's telling you to play or sing in a smooth, flowing way, with all the notes connected.
The word legato is Italian, and it literally means "tied together." If you're playing or singing a melody legato, it's as if each note is tied to the one before it and after it, forming a continuous flow of sound. The opposite of legato is staccato, where each note is played briefly and separately, producing a choppy sound.