A E Minor 7 (Em7) chord contains the notes E, B, D, G. It is built from the minor 7th formula 1 - ♭3 - 5 - ♭7, with E as the root.
Is Em7 easier to play than Em?
About the same, and some find it easier. Em7 uses two fingers like Em, and several common voicings drop a finger entirely, letting more open strings ring. The result sounds more sophisticated without being harder to fret.