Paper tablets OR digital notebook are basically replacement of paper and printed notes, you can save your digital notes on google drive or any other storage, they have clear and paper like displays that is less harmful to eyes then other tablets and monitor screen.
Some of the paper tablets have clear paper like displays that are exactly like paper and you can take notes through pen, their built is stronger and are more handy then the normal regular tablets, they have longer battery life, they are more famous in between people who love art and drawing but are also being widely used by students for taking notes and as because of tablets they have no need of carrying heavy books