 Punishment. Punishment is a procedure to reduce behavior. So, would you like a definition? It's really simple. So, the contingent application or removal of a stimulus to reduce a behavior. Actually, let me try that again. The contingent application, that's the positive punishment, or removal, negative punishment, that results in a reduction of behavior in the future in that context, right? So, I added the context piece, blah, blah, blah. Anyway, so if I want to reduce a particular behavior, I could positively punish. I positively punished myself for saying something inappropriate, right? So, hopefully, by punching myself, that's a positive punishment. How is that positive? You don't need to worry about that right now. It's just that the stimulus was added. So, removing something is a negative punisher. So anyway, so the loss of something reduces a behavior. The addition of something can reduce a behavior. Both are punishment, and the key with punishment is to know that it happened, to know that it was punishment, you have to watch the behavior. Did the behavior decrease? If the behavior decreased, then whatever you did was punishment.