@ViewScoped: -As long as the user is interacting with a similar JSF view, the beans are alive. It is usually created on an HTTP request. The bean gets destroyed when the user post-backs to a different view.

@SessionScoped:- Beans are there as long as HTTP session lives. This gets created with the first HTTP request. This bean is destroyed when the HTTP session is invalidated.

@CustomScoped:- This bean is there when it enters in the map of custom. It is created for a particular scope live.

@RequestScoped: -Beans are there as long as the HTTP request-response lives. This usually gets created when an HTTP is requested. It gets destroyed when the HTTP request is over.

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