Blank verse is unrhymed iambic pentameter. It has been widely used in English poetry since the 16th century, especially for long works like plays, epics, and narrative poems. Some key uses include Shakespeare's plays, Milton's Paradise Lost, and Romantic poems like Wordsworth's Prelude. Blank verse allows for flexibility and natural syntax while maintaining a rhythmic structure. It became a dominant poetic form during the Renaissance and remained important until the rise of free verse in the 20th century.