If logic applies in all possible worlds, does that mean that that which is logic in our world stays the same in all of them, since we define those worlds as possible through it, meaning that the proposition by which we define logic in our world is true in all possible worlds? Wouldn't that mean that the definition of logic should be a tautology, and thus uninformative? This has been on my mind for quite some time and I'd really appreciate some insight, since I haven't seen an uninformative definition of logic, but don't understand the fault of my reasoning. Thanks.
Edit: A possible world is a taken to be a consistent and complete description of how things might have been or might in fact be.