1. Alert Dialog Box.
2. Confirmation Dialog Box.
3. Prompt Dialog Box.
Alert Dialog Box
When we have to show warning meassage, we will use Alert Dialog Box, Suppose in form validation, User Name is mandatory field and user didn’t filled it, then we can show error message in Alert Dialog Box.
Confirmation Dialog Box
When user have to choose one option out of two.It display a dialog box with two button ok and cancel
If User click on OK then go to next step, if click on Cancel no action will perform.
Prompt Dialog Box
When you have to get user input through a text box pop-up. You have to fill the field and click on OK