One of the main differences is in their architecture. Angular is a full-featured framework that provides a lot of built-in functionality, such as a powerful template system, a rich set of directives and services, and a powerful dependency injection system. React, on the other hand, is a library that focuses mainly on the view layer and is often used in conjunction with other libraries and frameworks to build complete web applications.
Another difference is in their approach to componentization. Angular uses a component-based architecture, where an application is composed of a tree of loosely-coupled components that interact with one another. React, on the other hand, uses a component-based architecture, but with a more functional approach, where components are simple, pure functions that take in props and return a description of the component’s UI.
React also uses a virtual DOM, which improves the performance of the application by reducing the number of changes made to the actual DOM. Angular does not use a virtual DOM, but it does have a change detection mechanism that helps improve performance by only updating the parts of the DOM that have actually changed.
Both React and Angular are widely used by developers, and both have a large and active community. The choice between the two often comes down to personal preference and the specific needs of the project.