Much like a post-it or sticky note, Notes is a feature that allows users to add comments to objects and spaces. They can be added, modified, and deleted as well as moved anywhere within the space (by dragging the note). Notes are useful for notifying other users of additional information on specific spaces, such as a small introduction to the space, how certain aspects of the space were built, what data may need to be added, etc. Basically, notes can be used to place any additional text you would like as an extra text on the space.