2. FTL drive in the re-imagined Battlestar Galactica is a device which bends space, allowing a spacecraft to instantly relocate between two points.
The drive itself takes on many shapes and forms throughout the science fiction genre but all incarnations accomplish the same goal. For example, in the universe of Star Wars, the concept of Hyperspace exists, a way to cross the galaxy in mere days. There's Warp (a way to not cross space but compress and stretch it) mentioned in Star Trek, EVE online, and Babylon 5, and the Concept of Slipspream Space mentioned in Halo, Andromeda and even in Star Trek.
In some cases, ships in transit are not able to communicate or even see each other due to them being outside normal reality, however, when exiting, ships can just appear out of nowhere in either a scattered group or a fine-tuned formation depending how advanced the drive is.