Text can refer to the written word: “Proofread your text before submitting the paper.” 

A text refers to any form of communication, primarily written or oral, that forms a coherent unit, often as an object of study. A book can be a text, and a speech can be a text, but television commercials, magazine ads, website, and emails can also be texts: “Dieting advertisements formed one of the textswe studied in my Sociology class.”