The Knowledge Argument is about whether or not we can truly understand what it's like to be a computer or a robot. It says that even if we have all the facts about how a computer or robot works, what it knows, and how it behaves, we still can't really know what it's like to be them. We can't feel what they feel or experience what they experience. So, even though we may know everything about how a computer works, we can't really know what 'being a computer' feels like.