POETRY. Poetry is usually the shortest of the three forms, written in lined verse and stanzas; poems can be rhyming or unrhymed, and include aspects, such as meter and rhythm, not usually found in short stories and drama. Poetry can tell a story, but it is usually written to aesthetically appeal to the emotions.
SHORT STORY. A fictional piece of prose usually no more than about 30 pages (longer works would be considered a novella or novel), the short story most often takes place over a shorter period of time than a novel, with fewer characters, settings and sub-plots. It generally is written as a narrative form of story-telling
DRAMA. A play is meant to be performed on stage. It can be written in prose or verse, but its structure includes specific designations for each line (or passage) attributed to individual characters. Stage directions, such as entrances and exits, are usually included. Music, song and dance are often included.