How do you discipline your toddler?

My kids are 3 years and 1 year old. If they don't get something that they want, they will cry. I will just leave them to cry. When they see that I've no reaction to it, they will come hugging me. After which, I will explain to them why they can't behave this way. It's the same when they throw tantrums, I will just leave them and walk away. They knows that they are not getting my attention, they will stop and come chasing after me.