How do sonnets and other poems use description?

"The sonnets are constructed with three quatrains (four-line stanzas) and one couplet (two lines) in the meter of iambic pentameter (like his plays). By the third couplet, the sonnets usually take a turn, and the poet comes to some kind of epiphany or teaches the reader a lesson of some sort."

this question is grammatically incorrect and is illegible to me so i can not answer.