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There are answers before mine; so I will only add that one other use of a poem or rhyming verse (which I did not see in those answers) is as a clue to some mystery. This can represent a riddle dire...
Answer
#4: Attribution notice removed
Source: https://writers.stackexchange.com/a/43364 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#3: Attribution notice added
Source: https://writers.stackexchange.com/a/43364 License name: CC BY-SA 3.0 License URL: https://creativecommons.org/licenses/by-sa/3.0/
#2: Initial revision
There are answers before mine; so I will only add that one other use of a poem or rhyming verse (which I did not see in those answers) is as a clue to some mystery. This can represent a riddle directly, or it is a riddle _disguised_ as poem, like a love poem or an elegy on a gravestone. I cannot recall exactly, but I believe Dan Brown has used this device in his religious mysteries.