Iambic pentameter is a type of poetic meter that consists of five feet per line, where each foot is an iamb, which is a two-syllable unit with the first syllable unstressed and the second syllable stressed. This rhythmic pattern is fundamental to the structure of many forms of poetry, especially sonnets, and creates a natural flow that mimics human speech. It is one of the most commonly used meters in English poetry, allowing for both expressive and rhythmic qualities.