World Expos, also known as World Expositions or Universal Expositions, are large international exhibitions that showcase the achievements of nations. They provide a platform for countries to present their culture, technology, and innovations to a global audience. Each Expo has a specific theme, allowing participants to explore various topics, from sustainability to technological advancements. These events, which date back to the mid-19th century, attract millions of visitors and feature pavilions from different countries. Notable examples include the 1851 Great Exhibition in London and the 1967 Expo 67 in Montreal. World Expos foster international cooperation and cultural exchange, making them significant global events.