For Wikipedia’s own style manual, see Wikipedia:Manual of Style. It is often called a style sheet, though that term has other meanings. A style guide establishes oxford guide to style pdf enforces style to improve communication.
To do that, it ensures consistency within a document and across multiple documents and enforces best practice in usage and in language composition, visual composition, orthography and typography. 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 specific industries. Style guides vary widely in scope and size. A short style guide is often called a style sheet.
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. This, of course, may be subject to national variety such as the different varieties of American English and British English.
Some style guides focus on specific topic areas such as graphic design, including typography. Website style guides cover a publication’s visual and technical aspects along with text. Style guides that cover usage may suggest ways of describing people that avoid racism, sexism, and homophobia.
Most style guides are revised periodically to accommodate changes in conventions and usage. The frequency of updating and the revision control are determined by the subject matter.