Substitute teachers are educators who temporarily fill in for regular teachers when they are absent due to illness, personal reasons, or professional development. They are responsible for maintaining classroom order, delivering lesson plans, and ensuring that students continue their learning in the teacher's absence. These professionals may work in various educational settings, including elementary schools, middle schools, and high schools. Substitute teachers often need to be flexible and adaptable, as they may teach different subjects and grade levels. Many states require substitutes to have a teaching license or certification, while others may allow individuals with a high school diploma to serve in this role.