Paper is a thin sheet material produced by mechanically and/or chemically processing cellulose fibers derived from wood, rags, grasses or other vegetable sources in water. Draining the water through fine mesh leaving the fiber evenly distributed on the surface, followed by pressing and drying. (Source : Wikipedia)
There are various types of paper for office use, art & craft, printing, binding and others.
The most common 7 types of papers are : repro paper also called as printing paper, coated paper, tissue paper, newsprint, cardboard, paper board and fine art paper.