Spring is a popular framework with a strong MVC (Media - View - Controller), which provides various features which are helpful to create safe and secure applications. Spring rest controller is one of the features. It is an annotation that is used to create a restful controller. Rest controller is a specialization of Container. Spring rest controller adds controller and response body in a program that converts responses in JSON or XML. Restful applications use REST architecture, which is helpful to create network applications. Restful applications return the value in JSON or XML format.
Spring Boot is a prevalent framework in the web development sector, as there are many accessible and valuable features in its MVC which are simple to use and implement in code. Spring framework brings a well-balanced workflow in web applications and security, dependency, and better features. To understand the Spring framework deeply, you need to learn it. Nowadays learning something is very easy, you can learn online at home.