What is React Native?

React Native Overview: 

• Developed by Facebook. 
• Enables cross-platform mobile app development using JavaScript. 
• Uses design principles from ReactJS. 

UI Development: 

• Compose mobile application UI using multiple components declaratively. 

Comparison with Previous Options: 

• Previous frameworks: Cordova, Ionic. 
• Hybrid apps using these frameworks lacked native performance. 

Performance: 

• React Native bridge invokes native rendering APIs (Objective-C for iOS, Java for Android). 
• Provides better performance than hybrid frameworks. 

Community and Popularity: 

• Active developer community. 
• Code available on GitHub with over 70k stars. 
• Quickly gained popularity in the React community.