Proper error handling is crucial for enhancing user experience and development efficiency in Angular applications. While traditional methods like ErrorHandler and HttpClient allow for basic error management, they often lead to code duplication and inefficiencies. HttpInterceptor, introduced in Angular 4.3.1, offers a more streamlined approach by allowing centralized error handling across all HTTP requests, making applications more maintainable and robust. Integrating external tools such as Rollbar further enhances this setup by providing real-time error tracking and detailed insights, which help developers quickly identify and resolve issues. Rollbar's integration with Angular applications through its SDK facilitates advanced monitoring and analysis, improving both the development process and user experience by enabling efficient error management and resolution.