A major seventh chord (M7 or Maj7) has a major triad plus a major seventh interval.

 

For instance, a C Major 7th or CM7 chord has the notes C, E, G, B, an AM7 chord has the notes A, C#, E, G#, and so on.  

​

The Swars are Sa, Ga, Pa, NI.

​

Another way of understanding 7th chords is to think of the chord as a combination of two overlapping triads - a major triad and a minor triad overlapping each other. A CM7 has the notes C, E, G, B. So, if you take the first 3 notes you get a C chord and if you take the last three notes, you get an Em chord. That is why the chord can give a feel of both chords and leaves you “floating” between the two chords!