A teacher is a professional who educates students in various subjects, helping them acquire knowledge and skills. They create lesson plans, deliver lectures, and assess student performance through tests and assignments. Teachers often work in schools, colleges, or universities and may specialize in subjects like mathematics, science, or literature. In addition to academic instruction, teachers play a vital role in fostering social and emotional development. They encourage critical thinking, creativity, and collaboration among students. Teachers also communicate with parents and guardians to discuss student progress and address any concerns, ensuring a supportive learning environment.