Expo is an open-source platform that helps developers with building and launching native apps for Android, iOS and the web. Expo is a cross-mobile app development platform helping developers to build and iterate ideas quickly using open-source. You can build one project that easily runs natively on any device. Using only one codebase in Expo, you can develop for any users' devices whether Android or iOS. Expo can handle the burdensome works of shipping the app to the application stores, so you don't have to work extra to share your app on the market for each operating system. When you need to update or fix a bug, you can easily deploy an update that users will see instantly, without downloading the application again. Some of the feature Expo offers are app-signing credentials management, collaboration in organizations, and priority build infrastructure.