Impulse is the most common form of thruster in the galaxy, developed by the terons as a multipurpose propulsion device. They have since spread it to every race they can, using it as their primary export to draw attention from organic races.
Impulse uses gravitic manipulation to accelerate objects. By focusing gravitic waves, it can drag small objects at hypervelocity speeds, or push much more massive objects at slower speeds.
Impulse has several different uses in the galaxy today, and is one of the most widely proliferated technologies in production. Impulse is used in ship maneuvering thrusters, hover vehicles, and weapon propulsion systems.