Guitar Chord

I never understand why musical chords exists the way they exist...

For example:
Gsus

A major G triad in which, generally, the third of the chord is replaced by the upper neighbor or fourth in the scale. A G sus chord consists of a Root (G), a fourth (C), and fifth (D). A G sus chord gives a feeling of anticipation, and a feeling of resolution is achieved when the fourth of the chord is resolved back to the major third.


But this one is interesting...

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Guess what is the holiest chord?

Gsus

At least this one make some sense...
[Another archetypal entertainment from Samuel Lee]