Open shape
020000
Em7 is the E minor 7 chord. Its notes are E, G, B and D. A softer minor sound. Useful in soul, pop and ii–V–I progressions.
020000
022033
xx2033
x79787
Numbers show frets from the low E string to the high e string; x means don't play that string.
Em7 is the ii7 chord in D major, the iii7 chord in C major and the vi7 chord in G major. That makes it a natural fit in songs written in those keys.
Every E, G, B and D on the first 12 frets. The filled dots are the root, E. Build your own shape from any nearby group.
Other E chords
Other minor 7 chords