What did sumerians use cuneiform for?

Cuneiform was the system of writing developed by the Sumerians.  They were in form wedged characters.  They used this system of writing for record purposes.  They were written on clay slabs with a sharp stylus as a pen.  After writing, they would heat these tablets and keep them for preserving important data.  It was said that with the development of this system, written history began.  Scholars had difficulty translating the cuneiform system of writing.  It was finally deciphered by British scholar Henry Rawlinson in 1847.

Yes all of them are right