Adult education involves teaching adults through various methods like night schools, community colleges, and lifelong learning centers. It aims to educate adults on topics not covered in regular schooling like religion, politics, and family planning. The principles of adult learning emphasize that learning must be problem-centered, experience-based, meaningful, and allow learner feedback. In India, the government has launched various programs since independence to promote adult education through night schools, community centers, and mass literacy campaigns to build an educated nation.