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The main concept behind React is the virtual DOM. The virtual DOM is a lightweight copy of the actual DOM, which is used to minimize the number of updates needed to be made to the actual DOM. When a component’s state changes, React creates a new virtual DOM tree and compares it to the previous tree. It then calculates the minimum number of changes that need to be made to update the actual DOM, and makes those changes. This approach provides a significant performance improvement over traditional DOM manipulation.
React also encourages the use of a declarative programming style. This means that developers specify what they want the UI to look like, and React takes care of the implementation details. This makes it easier to reason about the code and leads to fewer bugs.
React has a large and active community, which has produced a vast ecosystem of tools and libraries to support it. These include Redux, a state management library, React Router, for managing URLs and navigation, and Jest, a testing framework.
One of the unique features of React is its ability to render components on both the server and the client. This enables server-side rendering, which can improve the performance and accessibility of web applications.
Overall, React has become a widely popular choice for building web applications due to its performance, scalability, and ease of use.