text : (1) the main body of printed or written matter on a page (2) matter chiefly in the form of words or symbols that is treated as data for processing by computerized equipment (e.g. a text message) — Webster See also OneLook
Text : is a loose term for data (e.g. file contents) that represent only characters of readable material but not its graphical representation nor other objects (floating-point numbers, images, etc.). It may also include a limited number of “whitespace” characters that affect simple arrangement of text, such as spaces, line breaks, or tabulation characters — Webster
Writing is a medium of human communication that represents language and emotion through the inscription or recording of signs and symbols. In most languages, writing is a complement to speech or spoken language. Writing is not a language but a form of technology that developed as tools developed with human society. Within a language system, writing relies on many of the same structures as speech, such as vocabulary, grammar and semantics, with the added dependency of a system of signs or symbols. The result of writing is generally called text, and the recipient of text is called a reader. — Wikipedia
Typography is the art and technique of arranging type to make written language legible, readable and appealing when displayed. The arrangement of type involves selecting typefaces, point sizes, line lengths, line-spacing (leading), and letter-spacing (tracking), as well as adjusting the space between pairs of letters (kerning). — Wikipedia
Here are links to pages about closely related subjects.