Commandeering is when someone in charge, like a police officer or a government official, takes something that belongs to someone else without asking for permission or paying for it. It's like when your brother takes your toy without asking you first.
The people who do the commandeering might have a good reason for taking something, like if there's an emergency and they need to use someone's car to get to the hospital quickly. But even if there's a good reason, they should still try to ask for permission or pay for what they took if they can.
Commandeering can also happen in a war or during other times of conflict, when an army might take supplies or resources from the people or places they are fighting against.
Overall, commandeering means taking something that doesn't belong to you without asking or paying, and while it might be necessary in some situations, it's important to always try to do it in a fair and respectful way.