The D minor chord is a 3-note chord consisting of the notes D, F and A.
You can see these notes highlighted in the interactive piano chart below.
The chord itself is often abbreviated as Dm.
Chords that are a superset of Dm. The chords include more notes but always D, F and A.
Chords that are a subset of Dm. These contain less notes but all of them are included in Dm.
In case you prefer a non-interactive variant of the chord chart, we've embedded a PNG image below that shows the notes for the the Dm chord. Feel free to save or share the image as needed.