A sestet is a six-line stanza or poem, commonly used in various forms of poetry, including sonnets. In a traditional Italian sonnet, the sestet follows the octave, which consists of eight lines. The sestet often presents a resolution or a counterargument to the ideas introduced in the octave. Sestets can have different rhyme schemes, such as ABABAB or CDCDCD. They allow poets to explore themes and emotions in a concise manner, making them a popular choice for expressing complex ideas within a limited structure. Notable poets like Pablo Neruda and John Milton have effectively used sestets in their works.