How is a Shakespearean sonnet structured?

A Shakespearean sonnet is structured with three quatrains followed by a final couplet. This particular format allows for the development of an argument or theme in the first twelve lines, where each quatrain introduces a new perspective or idea related to the main topic. The concluding couplet then provides a resolution or commentary on what has been presented, often delivering a twist or insight that ties together the previous lines.

This structure is distinctive from other types of sonnets, such as the Petrarchan sonnet, which typically consists of an octave and a sestet, emphasizing a different relationship between its parts. In contrast, a Shakespearean sonnet's use of quatrains and a rhymed couplet contributes to its unique rhythmic qualities and thematic depth, making it a celebrated form in English literature.