An apprenticeship is a formal method of training in a skilled occupation, craft, or trade. During the apprenticeship period, the apprentice is employed to learn an occupation through a structured program of on-the-job training with related classroom technical instruction.
The United States Department of Labor recognizes more than 800 apprenticeable occupations. Most apprenticeships are in construction, manufacturing, transportation, and services. Apprenticeship training is the major way to prepare for some occupations, such as plumber or electrician. For many other occupations, such as carpenter, baker, or machinist, apprenticeship is one of several ways to prepare for skilled or "journey level" jobs.