Why are chords called major chords or minor chords?
Major and minor chords have a difference in one particular note, the third. Let’s look at how it gets that name through a simple example.
C major chords are composed of three notes: C E G. C minor chords have one slight variation: C E♭ G.
Because C to E spans 3 note letters (C D E), its interval is a third. However, there are two different third intervals in our example. The major chord has a major third interval. The minor chord has a minor third interval.
C to E is a major third interval, which is 2 steps in pitch.
C to E♭ is a minor third interval, which is 1.5 steps in pitch.
All major chords have a major third interval from the root to the third. All minor chords have a minor third interval from the root to the third.
If you are familiar with open chord forms, look at the difference between E major and E minor. You will notice the third changes by a half step. A major and A minor show the same difference. Another example is D major and D minor. All of these chords are great examples of the 1/2 step difference that separates the major chords from the minor chords.
For more on this topic, I highly recommend my lesson on chord construction and my lesson on intervals. If you want even more, check out my book, which covers both topics and many more.
This info about the major and minor chords, really help me out.
I am glad that it helped!