I assume you mean a 4th spacial dimension. Bluntly, nobody can really wrap their head around it. We live in a universe with 3 dimensions and our brains evolved to handle that. We can write formulas that show that more dimensions are possible and that they’re just so small that they’re basically drowned out by the 3 big ones.
The best source I’ve ever seen to understand how this might be is from this YouTube video where they ask you to imagine a 3rd dimension of you were a 2d being. Enjoy.
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