Assistant teachers are additional teachers assisting the primary teacher, often in the same classroom. There are different types around the world, as well as a variety of formal programs defining roles and responsibilities.
One type is a Foreign Language Assistant, which in Germany is run by the Educational Exchange Service (Pädagogischer Austauschdienst).
British schools employ teaching assistants, who are not considered fully qualified teachers, and as such, are guided by teachers but may supervise and teach groups of pupils independently. In the United Kingdom, the term "assistant teacher" used to be used to refer to any qualified or unqualified teacher who was not a head or deputy head teacher