Warp Drive
From Star Trek : Freedom's Wiki
Warp drive is a technology that allows space travel at faster-than-light speeds. It does this by generating warp fields to form a subspace bubble that envelops the starship, distorting the local spacetime continuum and moving the starship at velocities that exceed the speed of light. These velocities are referred to as warp factors.
It is one of many jobs of Engineers onboard a Federation starship to make sure the ship's warp drive is running correctly.
