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From the Wikipedia:

A Borg is a collective proper noun for a fictional group of people in the productions of the science fiction series Star Trek. The Borg are a collection of species that have turned into cybernetic organisms functioning as drones of the collective the hive, pseudo-race, dwelling in the Star Trek universe. The Borg take other species by force into the collective and connect them to "the hive mind"; the act is called assimilation and entails violence, abductions, and injections of cybernetic implants. The Borg's ultimate goal is "achieving perfection".

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The key is that the Borg only absorb useful cultures. 'Nuff said!