Think of tags as like a book index where you find words and which pages they are on, the same principle applies here. Although it's taken a stage further so it might not be the word, but the subject, so for example if you're looking for things to do with fractal gradients for example. A tag may bring back posts with gradient files, as well as posts that discuss gradients, or tutorials about them.

SG Parplot Sample 028

Parplot Presets

A complete list of presets for the Parplot variation. Parplot is a great variation to play with, so many cool preset designs to try and tweak.