A poem of 14 lines is known as a sonnet. A sonnet is a type of poem that originated in Italy in the 13th century and is characterized by having 14 lines. The most common form of sonnet is the Shakespearean sonnet, which consists of three quatrains (four-line stanzas) and a final couplet (two-line stanza) with a rhyme scheme of ABAB CDCD EFEF GG. The sonnet is a popular form for poets because it provides a structured framework for expressing complex thoughts and emotions.