Poetry

An arrangement of words containing meaning and musicality.

Most poems take the form of a series of lines separated into groups called stanzas.
A poem can be rhyming or nonrhyming,
with a regular meter or a free flow of polyrhythms.
There is debate over how a poem should be defined,
but there is little doubt about its ability to set a mood.

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A poem is identifiable by its literary and musical elements.

For example,
metaphor and alliteration are common in many poems.

A poem can contain any number of features.
Usually a poem is broken down into lines and stanzas.
They can contain full sentences or just fragments, or a combination.
A poem can be happy or sad, simple or complex, traditional or rebellious.

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The benefits of a poem often begin where those of prose leave off.
A poem can stretch the rules of grammar a bit more, using inventive
line breaks or punctuation to accentuate a phrase

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source : http://www.ehow.com/about_4574481_what-poem.html