Whats the meaning of a cardinal?

So little Joey comes to my wi dow every night at 4pm. He pecks on the window, flying up to the railing and squaks.
I go to feed him he flies off, waits untill i put the bird seeds in the house and shut the door, then he lands on the feeder, bows towards me and then begins to feed.
Anybody know the fork lore or story about what a cardinal represents?
Im currently curious as to why he chose me to keep on visiting. Other neighbors feed too, but its my door and my feeder he stays attached to. Its so beautiful, yet curious...