Expo is a technology company that provides a platform for building and deploying mobile applications. The company was founded in 2014 by James Ide and Charlie Cheever, who previously worked at Facebook. Expo's mission is to make it easy for developers to create high-quality mobile apps that can be deployed across multiple platforms. Expo's platform is built on top of React Native, a popular open-source framework for building mobile apps. React Native allows developers to write code once and deploy it across multiple platforms, including iOS, Android, and the web. Expo extends React Native by providing a set of tools and services that make it easier to build, test, and deploy mobile apps. One of the key features of Expo is its development environment, which includes a web-based IDE and a mobile app that can be used for testing and debugging. The IDE provides a visual interface for building user interfaces, managing assets, and configuring app settings. The mobile app allows developers to test their apps on real devices without the need for a separate development environment. Expo also provides a set of pre-built components and libraries that can be used to add common features to mobile apps, such as maps, camera access, and push notifications. These components are designed to be easy to use and customizable, allowing developers to quickly add functionality to their apps without having to write code from scratch. In addition to its development tools, Expo also provides a set of services for deploying and managing mobile apps. These services include a cloud-based build system that can be used to compile and package apps for distribution, as well as a set of analytics and monitoring tools for tracking app usage and performance. Expo has gained a large following among mobile app developers, particularly those who are new to mobile development or who are looking for a faster and easier way to build high-quality apps. The company has raised over $60 million in funding to date and has partnerships with major companies such as Microsoft and Amazon. With its focus on simplicity and ease of use, Expo is poised to continue growing as a leading platform for mobile app development.