Warp drive is the faster-than-light propulsion system that lets starships cross interstellar distances by wrapping themselves in a bubble of distorted space.
Warp drive works by generating a layered field of subspace distortion around a vessel, so the ship itself never exceeds light speed within its local bubble while the bubble carries it across vast distances. Energy usually comes from a controlled matter and antimatter reaction regulated by dilithium, and the field is shaped by coils inside the warp nacelles.
On Earth, Zefram Cochrane flew the first human warp-capable ship, the Phoenix, in 2063. The flight drew the attention of a passing Vulcan survey ship and led directly to first contact. Nearly a century later the Warp 5 programme produced the NX-class Enterprise, the first Earth ship able to reach deep space in reasonable time.
Speeds are measured on a warp factor scale, and the 24th-century scale treats warp 10 as an unreachable limit of infinite velocity. Repeated warp travel was found to damage subspace in certain regions, prompting Starfleet to impose a temporary speed limit after the Hekaras Corridor crisis. Later designs addressed the problem with variable-geometry nacelles.