Okay, so imagine you have a special toy car that can sense when somebody shines a flashlight on it. It has a little light on it that goes off whenever somebody shines a flashlight at it. That's kind of like a laser warning receiver.
A laser warning receiver is a device that can sense when somebody shines a laser at it. It's used in things like airplanes and tanks to help protect them from being attacked with a laser.
The laser warning receiver has special sensors that can detect when a laser beam hits it. When it does, it sends a signal to the people inside the airplane or tank to let them know they're being targeted. This can help them take evasive action to avoid being hit by the laser.
So basically, a laser warning receiver is like a really cool toy car that's built for grown-ups who want to protect themselves from lasers. It can sense when somebody is shining a laser at them and alert them so they can stay safe.