A peanut-butter and jelly (or jam) sandwich, or PB&J, includes one or more layers of peanut butter and one or more layers of jelly or jam on bread. Jelly is a fruit based spread, made primarily from fruit juice, while jam contains crushed fruit and fruit pulp. Sometimes the sandwich is eaten open-faced, or with one slice of bread folded over (effectively a "half sandwich"). The sandwich is quite common and popular in North America, especially for children; a 2002 survey showed the average American will have eaten 1,500 of these sandwiches before graduating from high school. Smuckers and other companies manufacture commercial sealed crustless sandwichs made of peanut butter and jelly.