Children's poetry is poetry written for, appropriate for, or enjoyed by children. Children's poetry is one of the oldest art forms, rooted in early oral tradition, folk poetry, and nursery rhymes. Children have always enjoyed both works of poetry written for children and works of poetry intended for adults. In the West, as people's conception of childhood changed, children's poetry shifted from being a teaching tool to a form of entertainment. The first glimpse of children being shaped by poetry was noted by The Opies, renowned anthologists and literary historians. They saw that before the mid-eighteenth century there wasn't much written for children aside from encouraging phrases. Ballads of the 18th century launched the modern genre of children's poetry. Today, many poets (such as Dr. Seuss, Shel Silverstein, and Jack Prelutsky) are primarily known for their work aimed at children; many poets who primarily write for adults (such as Ogden Nash and Robert Frost) are also known for beloved children's poetry. Source: Wikipedia (en)