Send Automatic Mail to particular person when the form is submitted

I want to send a mail to a person when the form is submitted. How to do it?

You can do it easily with notifications in ERPNext. For more info, check here https://docs.erpnext.com/docs/user/manual/en/notifications

Is this possible to do for only a particular doctype?

Yes, it’s possible to set up notifications for a specific DocType.