Written communication is to let others get to know with a written text. The aim is to convey the idea of the message sender is the author to get a reading.
Writing is to communicate to others to get acquainted with the written text. Is intended to convey the idea of a messenger is the author to the audience is the reader. Rather than focusing on the use of words and grammar.
Writing is a communication to others get to know with the text is written. The aim is to convey the ideas of the sender is the author to the audience's readers.