Once an appointment is set to meet up with a customer, a presentation should be made. A lot of work has previously gone into making the appointment.
Often you only have one opportunity to make a good impression, take the attention of the consumer, and interest them with your product/s or service/s.
Characteristically, the customer is extremely busy and your meeting is only one among the many that day. If you don't want to be just the other sales pitch in the eyes of customer then you had better do your homework and make sure that you make a outstanding presentation.