Imprinting can only happen to people who can turn into wolves - the shape shifters.
It's like love at first sight, but stronger, much stronger. it's like the ONE. your absolute soulmate. your one and only. life has no meaning with out them.
once they (in human form) even look at the right person they become like their everything.they're world.like everything revolves around them.you can do anything for them and you will.
Basically a really really REALLY REALLY strong love emotion that nothing can break apart.
It was meant to be a rare thing that happened but it happened to a lot of the guys in the Quileute Tribe.
If you read Eclipse... it's explained in the book. :) (Please answer my question too)