What are Native Modules, and how do you use them in React Native?

Native Modules allow integrating custom native code into a React Native app: 

• Custom Code: Write native code in Java (Android) or Objective-C/Swift (iOS). 
• JavaScript Bridge: Expose native functionalities to JavaScript through the bridge. 
• Integration: Use NativeModules to access and utilize native modules in the React Native app. 

Native Modules provide flexibility to leverage platform-specific features and optimize performance.