Osaka - Wikipedia
Origins: Jomon, Yayoi period. Periods Asuka and Nara . Heian to Edo period. Meiji to Heisei period. 21st century to the present. Climate and geography. Neighborhoods. List of wards. Energy policies. Nuclear power. Transportation. Culture and lifestyle .
Osaka, Japanese: Da Ban Shi ; Hepburn: Osaka shi, pronounced [o.sakaci]; more commonly known as Da Ban, Osaka [o.saka] (listen),) is a designated Japanese city in the Kansai Region of Honshu. It is Osaka Prefecture's capital and third-most populous Japanese city, after Tokyo and Yokohama. It has a population of approximately 2.7 million according to the 2020 census. 
Osaka was considered Japan's economic center. It had become a major regional port by the Kofun (300-538), and was briefly the imperial capital in the 7th- and 8th centuries. Osaka was a centre of Japanese culture and flourished during the Edo period (1603-1867). Osaka experienced rapid industrialization and increased in size after the Meiji Restoration. Osaka was established as a municipality in 1889. In the decades that followed, the construction boom stimulated population growth. By the 1900s Osaka was the main industrial center in the Taisho and Meiji periods. Osaka was a prominent contributor to postwar redevelopment, urban planning, and zoning standards. The city developed quickly as a major financial hub in the Keihanshin Metro Area.
Osaka is Japan's financial capital and is known for being one of the most multicultural, cosmopolitan and diverse cities. Osaka Exchange is located here, as well as headquarters for multinational electronics companies like Sharp and Panasonic. Osaka is a major international research and development center. It is home to Osaka University and Osaka Metropolitan University. Kansai University is also represented. Osaka Castle and Osaka Aquarium Kaiyukan are some of the most prominent landmarks.