It all comes down to one thing: where the flavor comes from. Vanilla extract is made by soaking real vanilla beans in alcohol and water, which pulls out those complex, aromatic compounds. Vanilla flavoring, on the other hand, is often made with synthetic vanillin—a lab-created molecule that mimics the main taste of vanilla.
Think of it like the difference between a hand-picked, sun-ripened strawberry and a strawberry-flavored candy. Both are sweet, sure, but one has depth, mystery, and a little soul.