A substitute teacher is an educator who temporarily fills in for a regular teacher when they are absent. This can happen for various reasons, such as illness, personal leave, or professional development. Substitute teachers are responsible for maintaining classroom order and ensuring that students complete assigned work. Typically, substitute teachers follow lesson plans left by the regular teacher and may also need to manage classroom behavior. They play a crucial role in providing continuity in education, helping students stay on track with their learning even when their regular teacher is unavailable.