A Mover is a creation tool in LittleBigPlanet 2 that moves the object you place it on. You can also place it on microchips, so that the object the microchip is placed on moves.
A mover can be tweaked so it moves any speed and direction on the X/Y plane. up, down, left, right, diagonally, you can even make both values to 0.0 so it floats. You can turn local space on or off. Which means that if it's on if you make it go up, and it gets rotated 90 degrees clockwise it will then go right. You can set the Accelaration so you can set how long it takes to reach it's maximum speed. You can also set the Decelaration so you can set how long it takes to stop. If it's placed on an object, you can set if it's visible in play mode or not.
If there is no input to the Mover, the object will move automatically.