Iambus is a type of poetic meter used in Ancient Greek and Latin poetry. It consists of two syllables, one short and one long, and is often used to create humorous or ironic effects. The term IAMBUS is derived from the Greek word for 'FOOT, ' and it is believed to have been invented by the poet Archilochus in the 7th century BC. It is still used in modern poetry, although it is less common than other forms of meter.