In the grand tradition of physicists who like to get weird, the Many Worlds Theory is a mind-bending idea that says, "Hey, reality's not just one thing, it's many. Like, a million, maybe more, depending on how you count."
Imagine you're playing a game of Dungeons & Dragons. You're a brave adventurer, exploring a fantasy world filled with danger and wonder. But, in the Many Worlds Theory, every time you make a decision, the universe splits into two separate realities: one where you did, and one where you didn't. It's like, reality's own, infinite, branching tree of life.
Want to know more about the implications? Check out our subpage on Implications of Many Worlds, or head on over to our Experimenting with Many Worlds page to see how it's being applied in the real world (or, you know, one of the many worlds).