A "mega city" is a large urban area with a population of over 10 million people. These cities often serve as economic, cultural, and political hubs, attracting people from various regions for job opportunities and better living standards. Examples of mega cities include Tokyo, New York City, and Mumbai. Mega cities face unique challenges, such as traffic congestion, pollution, and inadequate infrastructure. Rapid urbanization can strain resources like housing, water, and public services. To manage these issues, city planners and governments often implement sustainable development strategies to improve living conditions and promote efficient urban growth.