Envy-freeness

Envy-freeness is a situation where everyone gets something they like, and nobody wishes they had what someone else has. Let's say there are 5 kids who want to share a pizza. If the pizza is split into 5 pieces of equal size, and each kid gets the toppings they like, then everyone is happy and nobody is jealous of what someone else got. That is an example of an envy-free situation.

Now, imagine if the pizza was cut unevenly, so one kid got more cheese and another got more pepperoni. In this case, some kids might feel jealous or envious because they want what someone else got. This would not be an envy-free situation because not everyone is happy with what they got.

Envy-freeness is important in many situations, like sharing resources, dividing workloads, and distributing rewards. In each case, it's important to make sure everyone is happy with what they get so that nobody feels left out or jealous.