When you create forms, you can create views by selecting Standard (Windows) view or Web-Alternate (fixed) view. For most forms, you can use the standard view, which can be displayed in a browser.
If you are creating a new view of the same form (for example, if you are creating a Standard view and a separate web view), use a different label for the second view, so that the view name will be unique in the URL for the form. See Defining-and-managing-form-views.