Barre chord
fret 2, A shapex24342
Bmaj7 is the B major 7 chord. Its notes are B, D♯, F♯ and A♯. An open, reflective color. The major seventh sits a semitone below the root.
x24342
798877
Numbers show frets from the low E string to the high e string; x means don't play that string.
Bmaj7 is the Imaj7 chord in B major and the IVmaj7 chord in F♯ 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 major 7 chords