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Style Manuals, also known as style guides, provide:

• Clarity, consistency, and professionalism in written communication.
• A comprehensive set of rules and guidelines for writing and formatting documents consistently. 
• Standards for various aspects of writing, including grammar, punctuation, spelling, capitalization, formatting, and the citation of sources.

Styles can be generally associated with certain fields. These are some common guides:

APA (American Psychological Association): Commonly used in psychology, social sciences, and education. 

MLA (Modern Language Association): Frequently used in literature, languages, and humanities.

Chicago Manual of Style (CMOS): Widely used in history, the humanities, and some social sciences.

AP (Associated Press) Stylebook: Used by journalists and in news writing.

AMA (American Medical Association): Used in the medical field.