Okay kiddo, so imagine you're playing a game of tag with your friends. You don't want to get tagged, so you stand behind someone else and use them as a shield. That way, if someone tries to tag you, they might accidentally tag the person in front of you instead. This is kind of like what happened during the Iraq War.
The Iraq War was a big fight that the United States and some other countries had with Iraq back in 2003. The United States said they were fighting to get rid of weapons of mass destruction (which are really dangerous weapons that can hurt a lot of people). But some people think there were other reasons too.
Anyway, during this war, some bad guys who were fighting against the United States and its friends decided to use something called a "human shield." That means they would stand behind innocent people, like moms and dads and kids, to try to protect themselves.
Now, this was really not good. The bad guys were putting innocent people in danger, and that's just not okay. But at the same time, it made things really hard for the United States and its friends. They didn't want to hurt innocent people, but they also needed to stop the bad guys from doing bad things.
So, the United States and its friends had to be really careful. They used things like drones (which are like little flying cameras that can shoot missiles) to try to target the bad guys without hurting anyone else. And they also had to work really hard to try to convince the innocent people that they were there to help, not hurt.
It was a really tough situation, but in the end, the bad guys were defeated and the war was over. We just have to remember that it's never okay to use innocent people as shields in a fight. That's not fair or right.