How much a potential customer knows about a problem, a solution, or your product. From knowing nothing to being fully informed.
If you pitch a "fully informed" buyer the same way you pitch a "problem-unaware" buyer, you will fail. You must meet them where they are. If they don't know they have a problem, you need to sell the problem first, not the product. Aligning your content to their awareness level is the secret to high conversion rates.