i guess you don't NEED to give it but you'll only be doing yourself harm.
it'll look bad when you apply for a new job and depending on how important your job is it could cost you. i mean if you're flipping burgers at mcdonalds and quit then it's not too bad but if you're working at a hospital doing something then it could have severe consequences.
also it's a dick move.
You know what's a bigger dick move? Getting fired/let go completely out of nowhere and having to immediately worry about whether or not you can pay rent or bills in the near-future.