What is the difference between a dominant 7 chord and a major 7 chord in music theory?

The main difference between a dominant 7 chord and a major 7 chord is the seventh note used in the chord. In a dominant 7 chord, the seventh note is a minor seventh above the root note, creating a more tense and bluesy sound. In a major 7 chord, the seventh note is a major seventh above the root note, creating a more smooth and jazzy sound.