Okay kiddo, have you ever heard of someone who just vanished without a trace? That means they disappeared and nobody knows where they went or what happened to them. Sometimes it's a person who goes for a walk in the woods and never comes back, or maybe someone who gets on a plane and is never seen again. When this happens, it's called an "unexplained disappearance."
Sometimes, people disappear because they want to, maybe because they're running away from something or they want to start a new life. But other times, nobody knows why they disappeared. When this happens, it can be really scary because it feels like they could be anywhere and nobody knows if they're okay.
When an unexplained disappearance happens, a lot of people try to solve the mystery. Sometimes, the police get involved and they look for clues to figure out what happened to the missing person. Other times, people who know the missing person start their own searches or post flyers asking if anyone has seen them.
Unfortunately, sometimes an unexplained disappearance is never solved and the missing person is never found. This can be really sad for the people who love them and are left wondering where they went.
So, in summary, an unexplained disappearance is when someone disappears without anyone knowing what happened to them. It can be scary and sometimes it's never solved.