React is a lightweight and focused technology, which works well on its own for simple sites or with a choice of other software for more complex applications. React makes no assumptions about what stack you're using so you're free to use whatever is best for the job.
React breaks the application into components and uses a one-way flow of data which lead to predictable and highly testable modular pieces. These pieces can be interchanged and reused, reducing rework. This means that we can develop faster
React removes unnecessary work from the browser, only making updates when there are real changes. This reduces lag and delays often seen on highly dynamic pages, making your application seem faster and more responsive to the user. This means better performance and user experience for your website
Predictable data flow helps to reduce complexity
SEO support with server-side rendering
Excellent testing support allows for comprehensive unit testing
Pages appear quick to users as lag is kept to a minimum
"You can be a lot more productive with React and build a front end much faster as it is so concise and well designed"