Explaining the difference between ActionForm and DynaActionForm in Struts

ActionForm in Struts is a class that is used to encapsulate the data that is submitted from a form on a web page. It is a part of the Model layer in the MVC architecture of Struts. ActionForm class provides properties for each of the form fields and often includes methods to validate the form data.

On the other hand, DynaActionForm is a subclass of ActionForm that allows for more dynamic handling of form data. It does not require explicit declaration of form properties and can handle properties that are not known at compile time. DynaActionForm is used when the form data structure is not fixed.

In summary, the main difference between ActionForm and DynaActionForm in Struts is that ActionForm requires explicit declaration of form properties while DynaActionForm allows for dynamic handling of form data without the need for explicit property declaration.