Tense, bluesy, and commanding. Wants to resolve to the tonic.
The D Dominant 7th chord (D7) is built on the root note D with component pitches D, F#, A, C. Formula: [0 - 4 - 7 - 10 semitones]. Category: Dominant 7th (4 tones). Primary genres: Blues, Jazz, Rock and Roll, Funk.
Notes in this chord: D - F# - A - C
Use as the V chord to create a strong pull back to your I chord.