Determining the largest city in the world can be complex, as it can be based on different criteria such as population, land area, or economic significance. By population, Tokyo, Japan, stands as the largest, with over 37 million residents in its metropolitan area. In terms of land area, the title often goes to cities like Chongqing, China, or Shanghai, China, due to their expansive urban sprawl. Economic powerhouses like New York City and Tokyo also contend for the title, considering factors like GDP and global influence. Ultimately, the definition of "largest" varies, depending on the specific metric being considered.