Allow for FTL travel with out the need of a worm hole. Once moving faster than light it is impossible to get meaningful navigational information. So advanced calculations are required before creating the bubble to prevent any collisions.
Warp drives function by creating a warp bubble using positive an negative energy, powered by exotic matter. This bubble compresses space time in front of the craft and expanding it behind it.While warp drives allow much more freedom of travel than worm holes exotic matter is usually prohibitively expensive for travel. Most ships that utilize warp drives are military, exploration, or pirate ships.