Iambic pentameter is a type of poetic meter that consists of five iambs per line, where an iamb is a metrical foot composed of an unstressed syllable followed by a stressed syllable. This rhythmic pattern mimics the natural flow of speech and was widely used during the Renaissance, particularly in English poetry and drama. It creates a musical quality and enhances the emotional impact of the text, making it a favored choice among poets and playwrights of that era.