A D Minor 7 (Dm7) chord contains the notes D, A, C, F. It is built from the minor 7th formula 1 - ♭3 - 5 - ♭7, with D as the root.
What is a ii–V–I progression in C?
Dm7 – G7 – Cmaj7. Dm7 is the ii, G7 the V and Cmaj7 the I. It's the single most recognisable progression in jazz, and it migrated straight into pop, soul and R&B writing.