React Native is great for writing mobile applications. It lets you use web paradigms for UI construction, which are usually much simpler than the native analogues. Tools like Expo make developing apps even easier, allowing developers to mostly ignore the native side of things.
What is CarPlay? CarPlay is an Apple iOS car integration standard that allows you to display content from your iPhone onto your compatible car head unit and control your phone. Common uses for this include casting music from services such as Spotify or Apple Music or for trip navigation using a map application.
Mobile development mostly deals with 2 platforms: iOS and Android. There are distinct ecosystems for both platforms — each has its own languages (Java and Kotlin for Android, Objective-C, and Swift for iOS), its own standard environment (Android Studio for Android, Xcode for iOS), its own app architectures, app stores, libraries, etc.
What is React Native React Native is a JavaScript framework for writing hybrid native mobile applications for both iOS and Android platforms.