React enforces a unidirectional data flow, which means data only flows in one direction—from parent to child components. This design simplifies debugging and understanding how data is passed through your application. It ensures that data management is predictable, reducing the chances of unexpected side effects when your application's state changes. This is particularly useful in complex applications where managing state and data flow can quickly become overwhelming.
The Virtual DOM is a core feature of React that solves performance bottlenecks in web applications. Instead of directly manipulating the real DOM (which is slow and resource-intensive), React creates a lightweight copy of the DOM called the Virtual DOM. When the state of an application changes, React updates the Virtual DOM first. Then, it compares the Virtual DOM with the real DOM and efficiently updates only the parts that have changed. This makes React apps faster and more responsive, especially when dealing with complex UIs.
More info here: Virtual DOM
React's component-based architecture allows developers to build encapsulated components that manage their own state and logic. These components can be reused across different parts of an application or even across multiple projects. This reusability reduces redundancy in your codebase, making your applications easier to maintain, test, and scale. It also promotes a modular approach to development, where complex UIs are composed of simpler, reusable building blocks.