A substitute teacher is a person who teaches a school class when the regular
teacher is unavailable due to an emergency such as illness, personal leave, or other reasons. “Substitute teacher” (usually abbreviated as “sub”) is the most commonly used phrase in the United states, Canada (except Ontario), India and Ireland, while supply teacher is the most commonly used term in Great Britain and the Canadian province of Ontario.
At the Teachers Web, we have a database of qualified substitute teachers who are vetted and available within 24 hours. The substitute is generally responsible for closely following and continuing with the lesson plans left by the teacher, and to maintain student order, productivity and to prevent disruptions to regular class activities. The idea is that continuity exists between the work done by the substitute and that done by the class teacher. Substitutes work with the same students as the regular teacher does.