Though this question is vague, the asker may be questioning why one would write on paper, as opposed to papyrus or on a slate. In this case, paper has an advantage because it is readily available, portable, and more permanent than slate. Prior to the 1900s, students practiced writing on slate because paper was expensive and not very common. In ancient history, the Egyptians wrote on papyrus, which was rougher and more difficult to write on than paper.
If the asker means the advantages of writing on paper rather than on a computer, the advantage is that paper sends a more personal message and can be saved to treasure later. Though paper can be destroyed in a fire or flood, computers are more tempermental and can lose entire manuscripts without warning due to a malfunction or virus.
the pyramid tombs
papyrus
a sentence for papyrus iswe are studing the ancient Egyptian writing paper papyrus
I'm writing on papyrus right now!
papyrus
Heiroglyphs were a system of writing developed in Egypt for carving into stone or writing on papyrus.
papyrus
Papyrus paper is a thick paper-like material made from the pith of the papyrus plant. It was used extensively in ancient Egypt and other Mediterranean cultures for writing and drawing. Papyrus paper is known for its durability and is an important historical material for understanding the development of writing and civilization.
A papyrus stick.
On a material called papyrus
Papyrus was the new thing for egyptians back then. We probably think of papyrus as paper when we think of it at all. True, the principle importance of papyrus was as a surface for writing and illustrations.
According to Herodotus, the Phoenicians brought writing and Papyrus - an old writing material, similar to our paper - to Greece. The Greek word for papyrus as a writing material is biblion and the word for book is Biblos.