Osaka Station City is the name of the station and surrounding buildings in Umeda, it’s the largest transport hub in the city. The station is covered by a huge sloped roof that spans across all eleven JR tracks. Nearby you’ll find many department stores, hotels, bars and restaurants. Further afield, areas like Chayamachi and Nakazakicho are full of funky little stores and cafes.
It’s a cool area well worth exploring, personally I prefer Namba / Shinsaibashi as there’s a bit more open space!