Notes are a quick and easy way to attach additional information to a website. You can quickly add anecdotes, annotations, pithy comments, or reminders in a Note and have it available whenever you need it, wherever you need it. Your notes, like all of your Cocoon browsing information, are stored securely in the Cocoon Cloud and are available to you from any browser with the Cocoon add-on installed.
We can think of a thousand reasons why Notes would be useful. That's one reason why we created them. But mostly, we created Notes for the thousands of reasons we can't think of and that you will.