Title: List of style guides
Content:  A style guide, or style manual, is a set of standards for the writing and design of documents, either for general use or for a specific publication, organization or field. The implementation of a style guide provides uniformity in style and formatting within a document and across multiple documents. A set of standards for a specific organization is often known as "house style". Style guides are common for general and specialized use, for the general reading and writing audience, and for students and scholars of various academic disciplines, medicine, journalism, the law, government, business, and industry.
Title: Style guide
Content:  A style guide or manual of style is a set of standards for the writing, formatting, and design of documents. It is often called a style sheet, although that term also has multiple other meanings. The standards can be applied either for general use, or be required usage for an individual publication, a particular organization, or a specific field. A style guide establishes standard style requirements to improve communication by ensuring consistency both within a document, and across multiple documents. Because practices vary, a style guide may set out standards to be used in areas such as punctuation, capitalization, citing sources, formatting of numbers and dates, table appearance and other areas. 
Title: List of style guides
Content: The Associated Press Stylebook Basic Books ISBN: 978-0-917360-63-3. ; The New York Times Manual of Style and Usage. By Allan M. Siegal and William G. Connolly. ; The Wall Street Journal Guide to Business Style and Usage, by Ronald J. Alsop and the Staff of the Wall Street Journal. ; The BuzzFeed Style Guide: by Emmy Favilla and Megan Paolone. 
Title: List of style guides
Content: Association of Art Editors Style Guide 
Title: Style guide
Content:  style guide may require certain best practices in usage, language composition, visual composition, orthography, and typography. For academic and technical documents, a guide may also enforce the best practice in ethics (such as authorship, research ethics, and disclosure), pedagogy (such as exposition and clarity), and compliance (technical and regulatory). Style guides are specialized in a variety of ways, from the general use of a broad public audience, to a wide variety of specialized uses, such as for students and scholars of various academic disciplines, medicine, journalism, the law, government, business in general, and specific industries. The term house style refers to the individual style manual of a particular publisher or organization.
Title: List of style guides
Content: The BBC News Style Guide: by the British Broadcasting Corporation. ; The Economist Style Guide: by The Economist. ; The Guardian Style Guide: by The Guardian ; The Times Style and Usage Guide, by The Times. 
Title: Style sheet language
Content:  A style sheet language, or style language, is a computer language that expresses the presentation of structured documents. One attractive feature of structured documents is that the content can be reused in many contexts and presented in various ways. Different style sheets can be attached to the logical structure to produce different presentations. One modern style sheet language with widespread use is Cascading Style Sheets (CSS), which is used to style documents written in HTML, XHTML, SVG, XUL, and other markup languages. For content in structured documents to be presented, a set of stylistic rules – describing, for example, colors, fonts and layout – must be applied. A collection of stylistic rules is called a style sheet. Style sheets in the form of written documents have a long history of use by editors and typographers to ensure consistency of presentation, spelling and punctuation. In electronic publishing, style sheet languages are mostly used in the context of visual presentation rather than spelling and punctuation.
Title: Style sheet (desktop publishing)
Content:  Style sheets help publications maintain consistency, so common elements such as story text,  and   always appear the same. Style sheets also help save time allowing a designer to click once rather than having to apply each element one at a time and risk using an incorrect value. Finally, style sheets are also useful if a publication decides to make changes to a design - say, make the story text slightly smaller. A user with proper administrative access can make the change to the master style sheet and then "send" the revised style sheets to all users, so the change is automatically reflected. Formatvorlage Plantilla Gabarit (mise en page)
Title: Style guide
Content:  and is often called a style manual or manual of style (MOS or MoS). In many cases, a project such as one book, journal, or monograph series typically has a short style sheet that cascades over the somewhat larger style guide of an organization such as a publishing company, whose content is usually called house style. Most house styles, in turn, cascade over an industry-wide or profession-wide style manual that is even more comprehensive. Some examples of these industry style guides include the following: Finally, these reference works cascade over the orthographic norms of the language in use (for example, English orthography for English-language publications). This, of course, may be subject to national variety, such as the different varieties of American English and British English.
Title: Style guide
Content:  Style guides vary widely in scope and size.

Question: what are the value of style guides and style sheet?
Answer: improve communication.