How exactly does call flooding work?

I tried Googling it, but it comes up with so much information, I don’t know where to start or how to sift through everything.

Is it a specific program to be downloaded? Are there more than one type? Can it only be used on Linux?

@Markiemm#57768 OMG I’m sorry, I didn’t know :frowning:

They call the place and then hanging up spamming their phones