What was the earliest form of writing?

The earliest form of writing did not use letters, but Pictograms, meaning that each picture represented a single word or sound.

The earliest known writings are from Ancient Egypt and are known as hieroglyphics.  These pictograms have been traced back to 5,000 years ago.

Another form of early writing was Cuneiform scripts.  These were writings carved on wet clay tablets by using blunt reeds.