Definitions for "Thrusters"
Small axial jets used by the satellite to maintain its orbit. These are often fuelled by drazine or bi-propellant. In time, ion-engines will probably replace such thrusters.
Small reaction engines on a spacecraft that can provide thrust used to control its orbit, orientation and attitude.
Small blades inside a duct, applying force whichever way they are pointing. They respond much quicker than propellers.