Barre chord
fret 2, A shapex24232
Bm7 is the B minor 7 chord. Its notes are B, D, F♯ and A. A softer minor sound. Useful in soul, pop and ii–V–I progressions.
x24232
797777
Numbers show frets from the low E string to the high e string; x means don't play that string.
Bm7 is the ii7 chord in A major, the iii7 chord in G major and the vi7 chord in D major. That makes it a natural fit in songs written in those keys.
Every B, D, F♯ and A on the first 12 frets. The filled dots are the root, B. Build your own shape from any nearby group.
Other B chords
Other minor 7 chords