Explain the concept of prototypes in Spring and how they work.

In Spring, the prototype scope (scope = "prototype") means that each time a bean is requested from the Spring container, a new instance of that bean is created.

This differs from singleton scope (scope = "singleton"), where a single instance is created for the entire application context.

How it works:

• When a bean is declared with the @Scope("prototype") annotation or in XML configuration, it is marked as prototype.
• When the application requests such a bean, Spring creates a new object, initializes it, and returns it.
• The container does not manage the lifecycle of prototype beans after creation; responsibility for their destruction lies with the calling code.

Example:

@Component
@Scope("prototype")
public class MyPrototypeBean {
    // fields and methods
}

// Elsewhere
@Autowired
private ApplicationContext context;

public void example() {
    MyPrototypeBean bean1 = context.getBean(MyPrototypeBean.class);
    MyPrototypeBean bean2 = context.getBean(MyPrototypeBean.class);
    // bean1 and bean2 are different instances
}

Used when a new bean instance is needed for each request, for example, to hold state specific to a particular operation.