A written language is the representation of a
language by means of a
writing system. Written language is an
invention in that it must be taught to children, who will instinctively learn or create
spoken or
gestural languages.A written language exists only as a complement to a specific spoken or gestural language, and no
natural language is purely written. However,
extinct languages may be in effect purely written when only their writings survive.Written languages evolve slower than corresponding spoken languages. When one or more
registers of a language comes to be strongly divergent from spoken language, the resulting situation is called
diglossia. However, such diglossia is often considered as one between
literary language and other registers, especially if the
writing system reflects its
pronunciation.
See more at Wikipedia.org...