Rhyme is one of the oldest basic techniques of Western poetry, creating a consonance of uses of similar sounding words in context with the narrative. Rhymes may be multiple in a line, or single rhymes in consecutive lines. In some cases rhymes may be structured so that specific words rhyme in consecutive or alternate lines. The usage of rhyme also applies to song lyrics. This is a convention, rather than an artistic requirement, of poetry.
Examples of Rhyme in Poetry:
|Single line multiple rhyme usage: The cat sat on the mat|
Consecutive line rhyme: Hey diddle diddle/ The cat and the fiddle