What is the role and purpose of bins in application development?

In the context of application development, especially with the use of the Spring Framework, a bean is an object managed by the IoC (Inversion of Control) container. Beans are components of the application that the container creates, configures, and manages their lifecycle.

Roles and purposes of beans:

• Encapsulation of business logic or services.
• Ensuring reusability and ease of testing.
• Automatic dependency management (Dependency Injection).
• Centralized management of configuration and settings.

Example of defining a bean in Spring using an annotation:

@Component
public class UserService {
    // business logic
}

The container will automatically create an instance of UserService and inject it where needed.