React is a popular JavaScript library that is often used for front-end web development. There are several situations where React may be a good choice for building the front-end of a web application:

1. Component-based architecture: React is built around a component-based architecture, which makes it easy to create reusable UI components. This can improve the maintainability of the code and reduce development time.
2. Large-scale applications: React is a good choice for building large-scale applications with complex UIs. It allows developers to break down the UI into smaller, reusable components, which can simplify the development process and improve performance.
3. Performance: React uses a virtual DOM, which allows it to update the UI more efficiently and improve the performance of the application.
4. Mobile applications: React can be used to build mobile applications using React Native, which allows developers to use the same codebase for both iOS and Android apps.
5. Developer community: React has a large and active developer community, which means that there are a lot of resources available for learning and troubleshooting.

In summary, React is a good choice for frontend web development in situations where a component-based architecture is important, large-scale applications with complex UIs are being built, performance is a priority, mobile applications are being developed, or where a large and active developer community is desired.