The Multiverse is the collection of alternate universes which share a universal hierarchy; it is a subsection of the larger Omniverse, the collection of all alternate universes. A parallel universe is created at the dawn of time at the same time as the main universe and other parallel universes. They may evolve similarly, but they are separate. Meanwhile, each universe has a main timeline, and at each moment, there are an infinite number of divergent timelines created off the main timeline. When thinking of divergent timelines, try picturing a fork in the road. Both paths lead in different directions, but they both start at the same point and were once the same road.