Prose vs. Poetry

[Britomart]

I wasn't sure where to post this topic. I have a question. How can a piece of writing with line breaks in it be called prose? Isn't one of the defining features of poetry the fact that it has line breaks? If not, what is the difference between prose and poetry then? I thought I knew the difference but maybe I don't.

[&*(9)%46#$&]

PROSE
Ordinary language people use in speaking or writing, distinguished from the language of poetry primarily in that the line
is not treated as a formal unit and it has no repetitive pattern of rhythm or meter.

Sidelight: The cadence of artistic or rhythmical prose is not pre-established, but emerges from the rhythm of thought.

PROSE POEM
A genre in the poetic spectrum between free verse and prose. It is distinguished by the poetic characteristics of rhythmic,
aural, and syntactic repetition, compression of thought, sustained intensity, and patterned structure, but is set on the page
in a continuous sequence of sentences as in prose, without line breaks.
http://shoga.wwa.com/~rgs/gl-p.html

[Britomart]

Thanks for the info.