The react-native-i18n library is a deprecated package that integrates I18n.js with React Native, using the user's preferred locale as the default. It is recommended to use the react-native-localize library instead, in conjunction with I18n-js or other internationalization libraries such as react-intl or react-i18next.
React Native is a framework for building mobile applications using React and JavaScript. It enables developers to write once and deploy to multiple platforms, including iOS, Android, and the web, while providing a native app-like experience to users.