Free verse is poetry that does not have a regular rhyme scheme or meter (the repetition of stressed and unstressed syllables). It is often characterized by its use of informal language and everyday speech rhythms, and it can have a more conversational tone than traditional poetry. Here is an example of free verse:
"The sky is a canvas,
Painted with clouds.
Some are big,
Some are small,
Some are white,
Some are gray."
Prose is writing that is not poetry. It is characterized by its use of sentences and paragraphs, and it can be fiction (stories) or nonfiction (articles, essays, etc.). Here is an example of prose:
"The sky was a beautiful shade of blue, with a few wispy white clouds floating overhead. The sun was shining brightly, and a gentle breeze was blowing through the trees. It was a perfect day to be outside."
In summary, free verse is a type of poetry that does not follow traditional rules of rhyme or meter, while prose is any writing that is not poetry.