7th chords are wonderful and satisfying, but at the same time they can be kind of confusing since there are so many different types of seventh chords. The most common type is the dominant 7th chord — usually just refered to as a “7th”. Then there is a major 7th chord, a minor 7th chord, a diminished 7th chord, a half-diminished 7th chord, an augmented 7th chord, etc, etc.

Watch this short video and hopefully it will clear up the confusion somewhat: