All right you morons - I know a chord when I see one. I've got a Masters degree in music, for crying out loud.
Here's your basic major chord (not to be confused with a major operation, a major-general, or a drum major):
minor chord (not to be confused with an underage minor, a coal-miner, or the minor league):
The three Augmented sixth chords (French, German, and Italian, which have their respective differences in regards to what you're supposed to drink as you listen to them):
The Tristan Chord (which Wagner made up in order to show off how smart he thought he was):
The Petrushka Chord (which was made up by Stravinsky to show that he thought he was just as smart as Wagner):
A Cluster Chord (which has the aural effect akin to that of a cluster bomb, although the maximum effective range is somewhat greater):
(And let's not forget blues chords, jazz chords, modal chords, the tri-tone [also known as the 'train whistle chord'] and others, but this is enough to start with.)
As you are no doubt aware, people have been making loads of money from selling these and many other chords. It's a lucrative business, but you can't get much heat out of them.