The largest city in the world by population is Tokyo, Japan. With a metropolitan area population exceeding 37 million people, Tokyo has emerged as a bustling megacity characterized by its unique blend of traditional culture and modern innovation. It serves as Japan's political, economic, and cultural center, featuring towering skyscrapers, historic temples, and vibrant neighborhoods. The city's extensive public transportation network, including its famous subway system, supports its large population, making it both accessible and efficient. Tokyo is also known for its diverse cuisine, entertainment, and technological advancements, attracting millions of visitors and residents alike.