When you're stuck on a really tricky math problem, you might ask your best friend for help, especially if she happens to be endowed with impressive mathematical skills. Endowed means "provided or equipped with."
When you have a special ability, you can say you're endowed with it. You can also be endowed with a quality, like beauty. Endowed is often used to describe something you're born with, though it can also refer to something that's been learned. Endowed traditionally meant "provided with money," especially when it came to a woman's dowry, the money she brought into a marriage. It's still used this way when someone donates, or endows, money to an institution.