A chapbook is a type of small printed booklet that was a popular medium for street literature throughout early modern Europe. Chapbooks were usually produced cheaply, illustrated with crude woodcuts and printed on a single sheet folded into 8, 12, 16, or 24 pages, sometimes bound with a saddle stitch. Printers provided chapbooks on credit to chapmen, who sold them both from door to door and at markets and fairs, then paying for the stock they sold. The tradition of chapbooks emerged during the 16th century as printed books were becoming affordable, with the medium ultimately reaching its height of popularity during the 17th and 18th centuries. Various ephemera and popular or folk literature were published as chapbooks, such as almanacs, children's literature, folklore, ballads, nursery rhymes, pamphlets, poetry, and political and religious tracts. The term chapbook remains in use by publishers to refer to short, inexpensive booklets.