Analysis of information sources in references of the Wikipedia article "Borg" in English language version.
Resistance is futile popular culture.
A cybernetic life-form thousands of years old which is part organic, part artificial life.
A third cube tried to conquer Earth by altering the timeline in 2373, but was destroyed with concentrated weapons fire by a Starfleet armada. It ejected a smaller, speherical ship, a Borg spehere, which created a time vortex that allowed the Sphere to travel back in time in an effort to stop humanity's first contact with an alien species. This effort was also thwarted, by Picard, his crew, and the Enterprise-E.