Different types of pickups

This is a 7.13 minute video response from David MacKenzie on Apr 21st, 2009

Question:

"Jaron asked "Hello everybody, I keep on seeing different types of pickups. Can you tell me the difference between Alnico, Ceramic, Active, Low Output, Hot output and active pickups? Do they sound different from each other? I can't really tell. I appreciate the help. From your favorite 14 year old, Jaron.""