The biggest school in the world is an online educational institution called National Open University of Nigeria (NOUN). Located in Lagos, this school offers students a variety of programs and certifications from undergraduate to doctoral level. NOUN boasts an impressive student body of over 170,000 registered members who can access courses and lectures anytime they want to through the school's online platform. In addition to its size, NOUN is also notable for its innovative approach to education. Its unique curriculum emphasizes the use of instructional technologies and other digital tools to facilitate learning in a variety of ways. This has made it possible for prospective students from anywhere in the world to take classes from NOUN, which makes the school even more accessible than traditional institutions. With its flexible learning options and expansive student body, NOUN is undoubtedly the biggest school in the world.