Chords are stacks of notes that sound together at the same time. At the base of all Chords is the Triad (three note chord). Triads are made up of the root, third and fifth tones as derived from the scale in use at the time. Even when we have a Chord with lots of extensions (notes added to the triad), we find there is always a triad at its base that is either Major, Minor or Diminished.
You will work with Chords throughout your musical career, so a thorough knowledge of Chords is vital. On this page, we are simply looking at Chords in their basic root position form.