What are the four common purposes of a written document?

The four common purposes of a written document are to inform, persuade, entertain, and express. Informative documents aim to provide facts and data, while persuasive documents seek to convince the reader to adopt a certain viewpoint or take action. Entertaining documents engage the audience through storytelling or humor, and expressive documents convey personal thoughts, emotions, or artistic ideas. Each purpose shapes the content, tone, and structure of the document accordingly.