A teacher works in primary and secondary schools, teaching children. A lecturer works in colleges and universities, teaching and researching at the bachelor's and master's levels. While both educate students, teachers can progress to administration roles like principal, while lecturers can become professors. To be a teacher requires a bachelor's degree and teaching certificate, while to be a lecturer requires passing the UGC NET exam. Their responsibilities also differ, with teachers focusing more on student support and testing while lecturers emphasize research and course guidance.