A two-front war is like when you have two enemies who want to fight with you at the same time. To explain this, imagine you are playing with your toys and suddenly two of your friends come and want to play with you. One friend wants to play with your toy car, and the other friend wants to play with your robot. But you only have one toy car and one robot. So, you have to decide which friend to give which toy. If you give the car to one friend, the other friend might get mad and start a fight. This is what happens in a two-front war, countries have to face two different enemies who might attack them at the same time, and the country has to spread its army to fight on two different fronts or lines. It is like playing two games at the same time, but very dangerous and not fun. It is tough for a country to fight on two fronts because the army will get exhausted and spread thin, and it may not have enough weapons and resources to fight on both fronts. This is why countries try to avoid getting into two-front wars, but sometimes it's not possible.