The Osaka Expo 2025 opened on Sunday in Japan. People from many countries will visit the Expo before it ends in October. The organizers hope more than 28 million visitors will go to it. A World Expo is an event that brings together people from all over the world. The first one was called the Great Exhibition. It took place in London in 1851. World Expos hope to find answers to some of the world's biggest problems. The Osaka Expo showcases the culture, history and economy of 158 countries. The theme is "Creating a future society for our lives." At the U.S. and Chinese pavilions, people can see exhibits on space travel. The Italian pavilion has exhibits on architecture, art, and environmental design.

The Osaka Expo is taking place on an artificial island in Osaka Bay. The 80 pavilions are housed in a giant, round wooden building called the Grand Ring. Guinness World Records said the building is the world's "largest wooden architectural structure". It is 20 metres high and has a 2-kilometre circumference. A one-day ticket for adults costs ¥7,500, which is about $52. Visitors will get to see many aspects of Japanese culture. There are exhibits on high-tech robots and flying cars, and on Hello Kitty and Gundam. Visitors will also see the Expo mascot. This is a mysterious creature called Myaku-Myaku. It has a blue face and many red eyeballs. It is good at finding rainbows.