A copywriter does on-demand writing based upon the projects presented to them. It would be advertising, video scripts, newsletters, articles, letters, etc. based upon the project presented. Copywriters could be employed by ad agencies or within a corporate marketing department. It requires that you have an engaging, creative writing style, are able to break complicated information down to terms that people can understand, and learn a lot of diverse information, quickly.

They write copy (any thing that is intended for printing).