Osaka is a city located on the Japanese island of Honshu. It is the capital of Osaka Prefecture and the largest city in the Kansai region. With a population of over 2.7 million people, it is Japan's third-largest city and one of the world's most populous cities. Osaka is known for its vibrant culture, food, and nightlife. It is also home to many historical sites, such as Osaka Castle and Sumiyoshi Taisha Shrine.