Crime against peace

Crime against peace means starting a war or attacking another country without a good reason. Think of it like this - when you're playing with your friend, you shouldn't hit them or take their toys without any reason, right? That's not fair and can make your friend sad or hurt. Similarly, when one country attacks another country without a valid reason, it can bring harm and sadness to a lot of people. These actions are considered to be crimes against peace. It's important for countries to always try to talk and find peaceful solutions instead of starting fights or wars.