Warp Drive
Warp Drive is an FTL technology used by many races, in many universes, dimensions, and more. It's one of the most common forms of Faster than Light travel due to its relative ease and cost of development compared to other technologies. As such, Warp Drive is often the first FTL technology a race implements for deep space travel, or the second, if they began their journey using Hyperdrive instead, and then later upgraded. Some begin their journey with warp drive technology by discovering and inventing it themselves, and others come into the technology (such as Earthfleet by either purchasing it, or having such technology gifted to them.
In some rare cases it's been acquired by races who came upon the technology after it was either intentionally, or accidentally left behind by others. Warp Drive itself is made possible by a wide variety of means, including the mixing of matter and antimatter, singularity, quantum eclipse, subspacial ellipse, and more. The only thing needed to achieve warp flight is the generation of sufficient energy to power anywhere from one, up to half a dozen or more nacelles that create the actual FTL flight. This energy, which is generated within the ship's warp reactor, is then sent to the nacelles, which process it into a field of energy that draws the ship down into subspace, and propels it forward on a wave of subspace energy like a surfboard.
Also, while warp drive shares many similarities to hyperdrive technology (thus why they're often developed so closely together, as they share many of the same principles and concepts), it differentiates itself by traveling through a different Level of Space than hyperdrive, or most other FTL technologies, and thus its fight characteristics, and overall maximum potential speed, are different than them. Also, because the actual type of FTL drive a ship uses is dependent on which level of subspace a ship enters, not everything that's called "Warp Drive" is in fact warp drive. At least not in the literal sense, because it's not the power core that's used to achieve FTL flight that truly determines what type of FTL drive it actually is.
So, in summary, a "Warp Drive" isn't a name for a specific type or class of FTL drive, but rather a more generalized naming convention used to identify what type of FTL travel is being used or employed. This is especially true since it's the nacelles that determine the method of FTL travel, and not the power course itself. So, to say one is using "Warp Drive" is equivalent to saying that, "I have a car," but then never specifying what kind of car, how many wheels, what type of engine, what type of fuel used, etc. With warp drive, it's basically the same thing.
