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Technical writing is any written form of writing or drafting technical communication used in a variety of technical and occupational fields, such as computer hardware and software, engineering, chemistry, aeronautics, robotics, finance, consumer electronics, and biotechnology. IT encompasses the largest sub-field within technical communication. The Society for Technical Communication defines technical communication as any form of communication that exhibits one or more of the following characteristics: "(1) communicating about technical or specialized topics, such as computer applications, medical procedures, or environmental regulations; (2) communicating through technology, such as web pages, help files, or social media sites; or (3) providing instructions about how to do something, regardless of the task's technical nature".