Okay kiddo, do you know what a soldier is? Yes? Good. Well, a mercenary is kind of like a soldier, but they work for money.
You see, some people or organizations may need help fighting in a war or protecting their property or people, but they don't have their own army or soldiers. So they might hire a group of mercenaries to come and do the fighting for them.
Now, why would someone want to be a mercenary? Well, they may not want to join the military or work for one country. They might also want to make a lot of money by offering their skills to the highest bidder.
But being a mercenary isn't just about fighting. They also have to be good at communicating, planning, and working as a team. They also have to follow strict rules and moral codes to make sure they don't cause harm to innocent people.
So while mercenary work can be dangerous and complicated, it can also be an important job for helping people and making money at the same time.