A family of Microsoft products that enable users to capture, organize, and reuse notes electronically.
Key word in what Rogn007 said, "primarily" only got computer use. I use OneNote for class sms also projects. Even when mostly paperless you still need to print stuff sometimes...just like excel. Even is not intended to be printed so much as used online but it is still useful! The absence of this to is about as stark as the absence of the ability to rotate pdfs.
If someone lists either of these ideas make sure to post a link here.