When the final syllables of two or more words have identical sound characteristics, usually at the end of a line, we say that they rhyme. Rhymes are identified by the letters of tha alphabet. The pattern they create is called rhyme scheme. Many poems have fixed rhyme schemes. This means that the same sequence of rhyming lines is repeated throughout.
I was angry with my friend A
I told my wrath did end A
I was angry with my foe B
I told it not,my wrath did grow B