Click to read in-depth answer. Also, what were the first written words?
The Sumerian archaic (pre-cuneiform) writing and Egyptian hieroglyphs are generally considered the earliest true writing systems, both emerging out of their ancestral proto-literate symbol systems from 3400–3100 BC, with earliest coherent texts from about 2600 BC.
what is the oldest written language in the world? Sumerian
Keeping this in consideration, where did the written word originate?
Written language, however, does not emerge until its invention in Sumer, southern Mesopotamia, c. 3500 -3000 BCE. This early writing was called cuneiform and consisted of making specific marks in wet clay with a reed implement.
Who invented the alphabet?
By at least the 8th century BCE the Greeks borrowed the Phoenician alphabet and adapted it to their own language, creating in the process the first "true" alphabet, in which vowels were accorded equal status with consonants.
