ELI5: Explain Like I'm 5

Multiverse

The multiverse is an idea that there is more than one version of the universe. In other words, it's like there are many different worlds that exist, with each one having different laws and different things in them. So, imagine that there is a "mirror" world where everything is the same as this one except that people there speak a different language and drive different cars. That's what it's like in the multiverse.