What is ActionForm in the struts?
When an <html:form/> is submitted, the Struts framework populates the matching data members of the ActionForm with the values entered in the <html:form/> tag. The Struts framework does this by using JavaBean introspection. This is all done by the class specified in the type attribute of the <html:form/> tag. This class will extends the org.apache.struts.action.ActionForm, as must all ActionForm objects with a get and set accessor that match its data members.