Sensory marketing includes all the marketing practices aiming to use one or more of the five senses to favor the purchase of a product or service.
The solicitation of the consumer’s senses is mainly doe through the product or at point of sale but it also plays an important role in customer loyalty through user experience.
The sight, touch and taste (for food) have obviously been part of the product marketing for a long time.
The term sensory marketing has especially appeared with the use of "less obvious" senses as the scent and sound for products and points of sale.
On the same subject, see:
How an hotel chain combines the different dimensions of sensory marketing: