Osaka prefecture is one of the two "urban prefecture" of Japon, along with Kyoto. You surely have already heard about its capital Osaka, the 3rd biggest city of Japan, and the capital of Kansai area. This city is well known by its foods (such as takoyaki: octopus dumplings), and appreciated by all Japanese, especially for the nice character of the people who live there. Historically, Osaka has always been a city of merchants thanks to its harbour and its nuermous canals facilitating trade.
Structured by underground shopping malls and futuristic skyscrappers, Osaka is embrassing modernity. But you can still find history and traditional culture with for instance Osaka castle and the Osamu Tezuka museum, "the father of manga".