Although the term "warp drive" for circumventing the light speed limit by distorting space around the spacecraft instead of technically moving through space originally comes from Star Trek, there is also a possibility that it may work in real life. The 1994 paper "The warp drive: Hyper-fast travel within general relativity" shows that it is possible to achieve by expanding space behind the spacecraft while contracting space in front of the spacecraft.
The original paper claimed that it would take absurd amounts of negative energy, but that was based on a simplistic view of using negative energy to produce antigravity in the same extremely inefficient way as the positive energy in ordinary matter gives massive objects gravity. That ignores the possibility for exotic physics allowing for vastly higher space distortion to energy ratios, i.e. finding out what makes gravity weaker than the other natural forces and then eliminate that weakness. As for producing negative energy, there is always vacuum energy.
It has been claimed that the causal disconnection between the spacecraft and the distortion at warp effects circumventing the light speed limit would make it impossible to control the effect and necessitate a prebuilt infrastructure, but that ignores several possibilities. One is to deliberately make the warp bubble unstable, making its lifespan finite so that it predictably disintegrates at the intended destination. Another possibility is to destroy the warp bubble at will by making quantum uncertainty necessary for its existence and destroy it my measuring (or, more technically correctly, interact with particles quantum entangled with the warp bubble.
Warp drive is not the same thing as variable speed of light, although both can be used for circumventing the speed of light limit.
It is possible that the electromagnetic force may be unified with gravity if the electric current is transformed to sufficiently high volt and low ampere to be conducted through vacuum.