The engagement session is a romantic photo compilation of you, when you are engaged. These are done usually few weeks before the wedding. It is a great opportunity to get used to the presence of the camera. Furthermore the time spent together during the session, helps you to have a cheerful and natural behaviour on your wedding too.
Why do I recommend the engagement session? It is not that common still to order a romantic photo compilation. However by years it will be just priceless to look at these kind of pictures.