What does defining the scope for beans with singleton and prototype values in Spring mean, and how does it affect their behavior?

In Spring, the scope of a bean defines its lifecycle and visibility.

• singleton — this is the default scope. Whenever a bean with this scope is requested, Spring returns the same instance throughout the container's lifecycle. This means the bean is created once and reused.

• prototype — a new instance is created each time the bean is requested. Spring does not manage the lifecycle of such beans after creation, so each call to getBean returns a new object.

Impact on behavior:

• Singleton beans save resources and maintain a shared state for all users.
• Prototype beans are useful when a new instance with independent state is needed for each use.

Example:

@Component
@Scope("prototype")
public class MyPrototypeBean {
    // each call to getBean creates a new object
}

@Component
@Scope("singleton")
public class MySingletonBean {
    // one object for the entire container
}

Thus, the choice of scope affects how and when objects are created and how long they live in the application.