Okay, kiddo, let me explain what a tiltrotor is. You know how a helicopter can take off and land like a plane, but also hover in the air? A tiltrotor is like a helicopter and a plane mixed together.
Instead of just having rotors on top of the vehicle, a tiltrotor has rotors that can tilt, like a helicopter's. But these rotors are also attached to wings, like a plane's. When the rotors are tilted upwards, the tiltrotor can take off and land vertically like a helicopter. But when the rotors are tilted forward, the tiltrotor can fly like a plane, faster and more efficiently.
So basically, a tiltrotor is a special kind of aircraft that can do two things at once: take off and land like a helicopter, and fly like a plane. It allows people to travel to places that are hard to reach with traditional aircraft, like remote locations or disaster zones. Cool, right?