Marooning is when someone is left alone on an island or in a remote place without any way of getting help. Imagine you and your friends go on a boat trip and accidentally leave someone behind on an island. That person would be marooned. It's like being stranded with no one to talk to, no food or water, and no way to escape. It's a scary and dangerous situation, which is why it's important to always make sure you have a plan and don't leave anyone behind.