Poetic feet are the building blocks of poetic meter, which is the rhythm of a poem. Iambs, which consist of two syllables with the second syllable being stressed, are the most common poetic feet. Iambi are similar to iambs but have an extra unstressed syllable at the end. Dactyls are composed of three syllables with the first syllable being stressed. Paens are made up of four syllables with the first and third syllables being stressed. Anapests are composed of three syllables with the last syllable being stressed.