Answer: iambic tetrameter is a way of writing each line if poetry (iamb) in four beats unstressed, stressed, unstressed, stressed, unstressed, stressed, unstressed, stressed
e.g. I WANDerd LONEly AS a CLOUD
Explanation: Each line has eight syllables in alternating stressed and unstressed
e.g. I wandered, lonely as a cloud/ That floats on high o'er dales and hills/ When, all at once, I saw a crowd/ A host of golden daffodils.