Cyberpunk is a dark, dystopian genre of Sci-Fi that William Gibson helped bring into modern culture with his award winning Sprawl Trilogy and Bridge Trilogy.
it is a hard genre to explain, and people seem to have different explanations. The best way I can put it is using its typical elements.
-Outcast antihero protagonists -Bleak visions of the future -huge megacorporations that practically control the world -Dark endings that are either bittersweet or flat out bad. Sometimes there is a good ending here and there, though. -Vast poverty and poor, with a huge divide between rich and poor. There is barely a middle class. -Brutal, realistic violence -sex -drugs