In a poem, a stanza refers to a section or division of lines within the poem that are separated from other sections by a space. A stanza can be seen as a paragraph in a poem, where each stanza often represents a different idea or image, and the number of lines in a stanza can vary depending on the poem's form or structure. Stanzas are often used to create rhythm, emphasize certain ideas, and help the reader understand the overall structure and meaning of the poem.