Awarp driveis a theoreticalfaster-than-light(FTL)spacecraft propulsionsystem. A spacecraft equipped with a warp drive may travel at speeds greater thanthat of lightby many orders of magnitude. In contrast to some otherFTL technologies such as ajump drive orhyperdrive, the warp drive does not permit instantaneous travel between two points, but rather involves a measurable passage of time which is pertinent to the concept. Spacecraft at warp velocity would continue to interact with objects in "normal space".

Einstein's theory of special relativity states that speed of light travel is impossible for material objects that, unlike photons, have a non-zero rest mass. The problem of a material object exceeding light speed is that an infinite amount of kinetic energy would be required to travel at exactly the speed of light. Warp drives serve to circumvent this limitation in fiction to facilitate stories set at galactic scales.

In addition to the possibility to let a spaceship glide through space in a warp field, there is also space folding. Spatial folding means that two points of space-time are directly connected and an instantaneous change takes place. The space between is simply folded into a higher-dimensional hyperspace or subspace.