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.

Jacks Trippy Curl v2

Jack’s Trippy Curl v2

This script is based on a flame created by Jack De Pauw with permission and randomized the params his gradient is provided but you will have to add the jacks_bw.map to your gradient folder to use it