Cyberpunk, I’ll try not to use my outdated dictionary from the nineties, though I’ll use some of it. It is defined by High Tech; Low Life. Specifically one could be as poor as someone who lives in a motel room (true story) and still have the money to make your own “Google Cardboard VR”. Generally there is a considerable amount of urban decay, although this doesn’t necessarily mean it can’t be set in suburbia.
The issue is that, as I’ve written my own variation of the genre, it’s evolved more in “Cyberpunk influenced X” x being whatever other genre I’m experimenting with at the moment.
William Gibson took on Cyberpunk after Bruce Bethke, who coined the term more for marketing reasons, to describe something (ironically more like what I do), and added a lot of the dystopian alements we associate with it.
Bruce Sterling was one who, in a sense, encouraged William Gibson along the way during the eighties, and was the only one of the two that was actually punk. Later on writers would come and go from the genre for different reasons.
Hope that helps.