The Transformers are a species of sentient, living robotic beings (mostly) originating from the distant machine world of Cybertron. The stories of their lives, their histories, and most especially their wars have been chronicled across many different continuities in the vast multiverse. The designation "Transformer" stems from the species' generally-shared ability to transform, to change their bodies at will, rearranging their component parts from a robotic primary mode (usually, but not always, humanoid) into an alternate form; generally vehicles, weapons, machinery, or animals. In some continuities this ability to transform is innate to all members of the species, in others it was a wartime innovation that was adopted by most, but not all, of the populace. Although "Transformer" is the most common term for these beings, there are others, mainly "Cybertron" as a reference to any being whose origin traces back to the planet in question (the adjective form being the more frequently used "Cybertronian" and occasionally "Cybertronic").