A form exclusive to the Saiyan race in Dragon Ball Z and onward. In order to go Super Saiyan for the first time, one must be either full-Saiyan or half-Saiyan. Early on, one must have gone through months or years of rigorous training, and have a pure heart or pure purpose. At first, one must've experienced something that would send them into a moment of ultimate rage, but over time that requirement was sidestepped.
On Danbooru, the tag indicates someone is going or already in Super Saiyan form, generally indicated by blonde, spiked hair, blue or green eyes, and a jagged, golden aura. Due to its nature as an umbrella tag, it is also used for references to the form (even if only the aura is used). Additionally, it can also be used as a stand-in for indeterminate cases, especially those born out of the difficulty in differentiating between the original Super Saiyan 1 form and Super Saiyan 2.
The following tags implicate this tag: legendary_super_saiyan, super_saiyan_1, super_saiyan_2, super_saiyan_3, super_saiyan_4, super_saiyan_blue, super_saiyan_god, and super_saiyan_rose (learn more).