Adapters

I nearly forgot to bring my adapter with me when I went to Las Vegas.  Without the adapter, I would not be able to log in to my computer or charge my camera battery... see how important an adapter is!  It goes the same with other adapters like for instance this fire hose adapter, without it, the water pressure might not be as strong and it will not serve any purpose.  Well, I guess that is how an adapter works, tell me if I am wrong. :)