Do gliders have engines

Yes and no... Pretty much every glider does not have an engine. A tow plane is used to take the glider up, then it detaches and uses thermals which come from the ground to lift its self up. Just like what a bird does. When a bird flies in circles, it has found a thermal and you will notice it is rising up... On the other hand, Germany has invented a glider with an engine that comes out for take off, and as soon as the glider is in the air, the engine goes back in.