Along with diction, syntax is a fundamental part of written language. Diction defines the style of written or spoken language, representing the choices a speaker or writer makes within the rules of grammar and syntax. Syntax states the rules for using words, phrases, clauses and punctuation, specifically to form sentences.
Correct syntax examples include word choice, matching number and tense, and placing words and phrases in the right order. While diction can be flexible, especially in casual conversation, proper syntax is comparatively strict. Following the rules of syntax is vital in formal writing of all kinds, and it is a clear sign that a writer is capable and well-informed.