A Dragon Break is a temporal phenomenon that involves a splitting of the natural timeline which results in branching parallel realities where the same events occur differently, or not at all. At the end of a dragon break, the timeline usually reconnects making all possibilities and outcomes truth, though some of them may contradict each other.
The "Dragon" that is mentioned is a reference to Akatosh, the God of Time.
- The most famous Dragon Break was the Warp in the West, an event which occurred in Illiac Bay region. 
- A possible example of a Dragon Break was the events that took place under the Red Mountain, where the Tribunal tapped into the heart of Lorkhan, activating the powers of Brass God Numidium, causing the entire Dwemer race to disappear almost instantly, save one.
When The Elder Scrolls II: Daggerfall was in development, Bethesda wanted to give the player the option for multiple endings. Rather than choose one specific ending as "canon", Bethesda canonized all the endings and made them all truth by introducing the concept of the Dragon Break.