Borg
The Borg are a society of cyborgs that control a large volume of space in the Delta Quadrant of the Milky Way galaxy in Star Trek. Originally conceived as a collective of "ultimate users" who would consume any useful technology they encountered, they were later re-invented as an expansionist regime that "assimilates" other species to acquire their technology, knowledge, and genetic material.
Attributes
The Borg population consists primarily of "drones" captured from other civilizations. Fitted with cybernetic implants, these drones are physically much stronger than normal humans. Borg drones communicate with each other via a constant stream subspace transmissions. This allows them to rapidly allocate resources in response to changing situations.
While the Borg have acquired vast stores of knowledge from civilizations they have assimilated, they seem to have lost the ability to innovate. They now learn solely by assimilating knowledge from other races, doing no research or inventing of their own. This proved to be a devastating disadvantage when they faced a species that resisted their assimilation technology.
Borg drones and starships include shielding technology that allows them to resist attack from energy weapons. These defenses rely heavily on the ability to identify the frequencies of incident beams and adapt the shield to block those frequencies.
Organization
The Borg exist as a Collective in which all individuals are directly connected to a massive computer network via cybernetic implants. Individual drones in the Collective can have varying levels of authority, with the Borg Queen operating as the highest-ranking member and directing Borg policy. In this way, the Borg Collective resembles an insect hive, albeit one with problem-solving intelligence, advanced technology, and enormous resources.
Territory
As of Star Trek: Voyager, Borg territory reportedly includes thousands of star systems. It would take an Intrepid-class Federation starship approximately two months to pass through their territory, presumably traveling the shortest available route at its best speed while avoiding contact.