What happens to a blocked garment after it goes in the washing machine?

Ok so I’m currently almost finished with my first crochet cardigan and I’m curious about blocking as I’ve never actually done it before. I’ve always made blankets and I’ve never blocked them, just threw them in the wash and they’ve been fine.

I’m using acrylic yarn (red heart super saver) and I wonder, if I block it what will happen to the blocking after I wash it - which I intend to do once finished anyway.