An appointment confirmation is proof that you have an appointment. You receive it after booking an appointment. It shows that your appointment has been officially scheduled.
You may receive it by email, mail, as a PDF, or by text message. The appointment confirmation may include the date, time, location, and information about what you need to bring. It's a good idea to bring it with you to your appointment.
If you do not receive an appointment confirmation, ask the authority or counseling center. They can confirm whether your appointment has been scheduled.