A propulsion method I was unaware of is electric propulsion (EP). An EP system consists of thruster components, propellant components, power components, and an optional pointing mechanism. Essentially, electric and magnetic fields react to charged particles in the rocket’s exhaust which accelerates charged particles that make up propellant.
This requires less energy than chemical rockets due to higher exhaust speeds, however, thrust is much weaker due to limited electric power. Therefore, electric propulsion is not currently used for rocket launches; instead, electric propulsion systems are used for station keeping, orbit raising, and primary propulsion in satellites.