ReactJS is an open source JavaScript library, with innumerable options that help develop simple, dynamic User Interfaces. ReactJS is widely popular not just because of its simplicity and ease, but also because it allows the developers build applications that are highly engaging, fast and effectively.
When a frontend development framework, which is essentially what your customers will interact with, and is the face of your business application, is loaded with great features, it is a smart choice that a business uses ReactJS. Additionally, ReactJS has data structures which are immutable, which translate to faster development and quick delivery times. New features can be added fast, existing features can be modified faster, all without going through the gruelling process of writing code from the scratch.