How to react to a child's temper tantrums

It usually occurs around two years. Suddenly the child, faced with a particular situation, becomes aggressive, furious. Patalea, falls to the ground, cries without ceasing and shouts. It's a tantrum. What can we do at the moment? Shall we talk to him? Do we punish you? Waiting for it to happen? We explain why tantrums and how to behave before them.