The World's Fair is a large public exhibition held in different countries, showcasing achievements in various fields such as technology, culture, and industry. These events, often organized by the Bureau International des Expositions, aim to promote innovation and foster international cooperation. Each fair features pavilions from participating nations, where they present their advancements and cultural heritage. Notable examples include the 1851 Great Exhibition in London and the 1967 Expo 67 in Montreal, which attracted millions of visitors and left lasting legacies in architecture and urban development.