An organism that is made up of both cybernetic and organic components. In anime, this generally refers to humans that have been altered to be partially robotic. A popular anime cyborg is Kusanagi Motoko from Ghost In The Shell.
It can be difficult to tell a cyborg apart from an android, especially when dealing with original characters and those whose origins are unknown. In cases like these, one should examine any visible robotic components. If they appear to be added-on or function as prosthetics, that character is likely a cyborg. If you are unable to determine whether the character is a cyborg or purely robotic, it's best to tag them as android until more information can be found.