What is the difference between Expo and React Native?
Expo uses only JavaScript to create React Native applications.
There is no differences, Expo is build on top of React Native as a layer of services for developers.
Technically, you can add Expo packages to a vanilla app and benefit from some of the features of the SDK.
Expo is a tool used with the new architecture to release React Native applications to production. It uses hermes to make iOS JavaScript runtime faster.