This document discusses the differences between writing and speech. Some key differences are that writing is usually permanent while speech can be corrected or changed as it is spoken. Written language also tends to be more complex with longer sentences and clauses, while spoken language contains more repetitions and interruptions. Writers can make use of formatting and layout techniques that are not available for speech, while speech utilizes tone, volume and other audio elements to provide context. Some grammar and vocabulary are also only used in one form versus the other.