Okay, the best way to compare is to look at clothing. Alternate dimensions? Different places. Like Hell versus Earth. they aren't the same places. So Hell would be a shirt. Earth a pair of pants. Sure, they're both clothes, meaning they're both places. And they could have things in common. Color, material. Those things are like basic rules. Gravity existing for example. Or the same label, which could be key individuals.
The multiverse? It has more that just that connection of being clothes. It can be two timelines that are VERY similar but not the same. Two different pairs of pants. For instance, in my dimension, there are two Hawkeyes. One is Clint Barton, the other is Kate Bishop. They work together as a team at times. They both like purple. They're both archers. But there are alternate dimensions where there's a Hawkeye and there's a Kate, but he's an Avenger and she works for Shield. Or she never got into heroics. So those are pants that are the same size but different colors?
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The multiverse? It has more that just that connection of being clothes. It can be two timelines that are VERY similar but not the same. Two different pairs of pants. For instance, in my dimension, there are two Hawkeyes. One is Clint Barton, the other is Kate Bishop. They work together as a team at times. They both like purple. They're both archers. But there are alternate dimensions where there's a Hawkeye and there's a Kate, but he's an Avenger and she works for Shield. Or she never got into heroics. So those are pants that are the same size but different colors?
Does that help?