AES works with a shared key. This won't work when you want to have an encrypted connection with a webshop (how would you get the key over there in a secure way?). For this you have asynchronous key algorithms such as RSA en ECDH. These algorithms can make a secure connection without anything preshared. Usually this is used to compute a shared key and then continue over AES. These asynchronous algorithms are at risk of being cracked with quantum computers.

Don't forget the confusing big bang/dinosaur bit in the middle of the movie that did nothing for the story nor had anything to do with it. I wished I walked out like many people did, I stayed hoping it would eventually make sense. I did not..