 Why, then, have philosophers believed they need to define narrow content and argue for its existence? The reason is that many philosophers have been convinced by some influential arguments that, in the most ordinary or typical sense of ‘content’, most or even all of the contents of our mental states are broad rather than narrow. If this conclusion is correct, if ordinary content is broad, then it requires some work to define an alternative, narrow conception of content, and it requires arguments to show that there is any such thing. To understand the issues about narrow content, then, it is essential to first understand the arguments that most ordinary content is broad.