A document or document file is a description of an electronic copy or hard copy of reference material for a product. To write and create an electronic document on a computer, use a word processor or other text editor. Once a document is created, it can be made into a hard copy by printing it.

A document is a written, drawn, presented, or memorialized representation of thought, often the manifestation of non-fictional, as well as fictional, content. The word originates from the Latin Documentum, which denotes a "teaching" or "lesson": the verb doceō denotes "to teach". In the past, the word was usually used to denote written proof useful as evidence of a truth or fact. In the computer age, "document" usually denotes a primarily textual computer file, including its structure and format, e.g. fonts, colors, and images. Contemporarily, "document" is not defined by its transmission medium, e.g., paper, given the existence of electronic documents. "Documentation" is distinct because it has more denotations than "document". Documents are also distinguished from "realia", which are three-dimensional objects that would otherwise satisfy the definition of "document" because they memorialize or represent thought; documents are considered more as 2-dimensional representations. While documents can have large varieties of customization, all documents can be shared freely and have the right to do so, creativity can be represented by documents, also. History, events, examples, opinions, etc. all can be expressed in documents

"lesson, written evidence" and directly from Latin documentum "example, proof, lesson," in Medieval Latin "official written instrument, authoritative paper," from docere "to show, teach, cause to know," originally "make to appear right," causative of decere "be seemly, fitting," from PIE root *dek- "to take, accept."

Main document: In a mail-merge operation in Word, this is the document that contains the text and graphics that are the same for each version of the merged document, such as the return address or the salutation in a form letter.