Building separate applications for the web, iOS, and Android can quickly become expensive. Each platform introduces its own development requirements, testing challenges, and maintenance costs, making it difficult for teams to deliver consistent experiences without duplicating significant amounts of work.

React offers a practical way to approach this problem through reusable components, declarative UI development, and a shared JavaScript ecosystem. By combining React for the web with React Native for mobile applications, teams can reuse business logic while adapting interfaces to the capabilities of each platform.

The key is understanding what should be shared and what should remain platform-specific.…