A writer was a person who used words in a variety of ways to convey a belief, story or idea.
Jake Sisko chose to become a writer instead of joining Starfleet like his father. Starting with poetry, Jake soon developed a fondness and talent for writing. He started at least two works; the novel Anslem, and the short story "Past Prologue". In 2373, Jake joined the Federation News Service as a war correspondent, remaining on Deep Space 9 while it was under Dominion control. (DS9: "The Abandoned", "The Muse", "The Ascent", "Call to Arms")
Newspaper and magazine writers served under an editor, who was responsible for the contents of the publication. An editor would give assignments to writers, and then in turn review the writers' works, make suggestions for changes, and compile these works for distribution. In 2374, Captain Benjamin Sisko experienced a vision from the Bajoran Prophets, in which he served as a writer for the Incredible Tales of Scientific Wonder, along with Herbert Rossoff, Julius Eaton, Kay Eaton and Albert Macklin. (DS9: "Far Beyond the Stars")