A poem which tells a story. Usually a long poem, sometimes even book length, the narrative may take the form of a plotless dialogue as in Robert Frost's "The Death of the Hired Man." In other instances the narrative may consist of a series of incidents, as in Homer's "The Ilaid" and "The Odyssey," John Milton's "Paradise Lost."
 (Definition taken from Literary Terms  at  http://www.tnellen.com/cybereng/lit_terms/terms/2terms.html) 


A Narrative poem:

1. tells a story

2. is longer than the usual poem

3. has one or more characters

4. has a setting, conflict, and a series of events that lead to a climax and conclusion

5. lines that are divided into stanzas