This document discusses React Native, a library that allows developers to build native mobile apps using React. It provides an overview of React Native, how it works, and its architecture. Key points include: - React Native uses React to bind JavaScript code to native iOS and Android components. This allows apps to run at near full speed. - The architecture includes a JavaScript thread that communicates with the native SDK via a message queue on the main thread. - Early adopters of React Native included Facebook, which used it to build their mobile apps. - React Native has a similar architecture for both iOS and Android, using bridges to connect JavaScript and native components. - Native code can be blended with React Native by embedding native