Component-based architecture is a design paradigm used in modern JavaScript frameworks and libraries that organizes an application’s user interface into modular, reusable components. Each component is a self-contained unit that encapsulates its own structure, style, and behavior, making it easier to develop, test, and maintain complex UIs. This approach allows developers to build applications by assembling these independent components, which can interact with each other through well-defined interfaces. The benefits of component-based architecture include enhanced code reusability, improved manageability of state and logic, and a more organized codebase, which ultimately leads to a more scalable and maintainable application. By breaking down the UI into smaller, manageable pieces, developers can focus on individual parts without being overwhelmed by the complexity of the entire application.