Substitute teaching involves filling in for regular teachers who are absent due to illness, personal reasons, or professional development. Substitute teachers are responsible for maintaining classroom order, delivering lesson plans, and ensuring that students continue their learning in the teacher's absence. They may work in various educational settings, including elementary, middle, and high schools. To become a substitute teacher, individuals typically need a high school diploma or equivalent, though some states require a college degree or specific certification. Substitute teachers must be adaptable, as they often work with different grade levels and subjects, and they play a crucial role in supporting the educational process.