An immensely powerful civilization fo enhanced humanoids from the Delta Quadrant of the galaxy. The Borg implant themselves with cybernetic devices, giving them great technological and combat capabilities. Different Borg are equipped with different hardware for specific tasks. Each Borg is tied into a sophiticated subspace communications network, forming hte Borg Collective, a shared consciousness in which the idea of the individual was nearly a meaningless concept. The Borg exhibit a high degree of intelligence and adaptability in their tactics. most means of defense or offense against them were foudn to work only once, almost immediatly after which the Borg developed a countermeasure. The Borg operated by conquering entire worlds, assimilating the civilizations and technology theron. Individual members of assimilated races were implanted with sophisticated cybernetic implants, permitting each individual to perform a specific task as required by the collective. Thousands of worlds across the galaxy were conquered in this fashion.
The first known contact between the Borg and the Federation was in 2365, when Q transported the Enterprise-D out of Federation space into the flight path of a Borg vessel heading toward the Alpha Quadrant.
"We are the Borg. Lower your shields. Your biological and technological distinctivness will be added to our own. Resistance if futile!"