What Is A Conspiracy Really ? & Double Bluffs

So this is just a general chit chat to get everyone's point of view of what the definition and context of the word " Conspiracy" means to them. To me, a conspiracy is a element used to define a piece of information or event that is not main stream or has had limitations put in on what you are aloud to know on it.

On top, this leads me to double bluffing, Ie A conspiracy based around a double bluff. I don't know much about double bluffing and how it is played out in a conspiracy so I am hoping someone can shed some light here ?