Paper is a thin material with many uses. The most common use of paper supplies are for writing and printing purposes. Though it's already in the 21st century and computers are becoming more and more in demand, papers are still very much needed in school and mostly in the workplace. Industries keep track of records in computers but it's always safe to have manual records. Writing on a paper is the most convenient way of taking down notes; you can just put it in your desk or post it in your wall.