Glory is brilliant, radiant beauty. You might admire a princess in all her glory, since she seems almost too gorgeous to be real.
Glory is also a term that is sometimes used in a religious way. It means the glow or light that appears around the head of a holy person or saint, like a halo. Another use of glory is a state of high honor gained from great achievements. If you have heard the expression "you're in your glory," it means that you are very happy and proud — you must have reached one of your big goals.