Bouquet

The aromas of wine are more diverse than its flavours. The human tongue is limited to the primary tastes perceived by taste receptors on the tongue – sourness, bitterness, saltiness, sweetness and savouriness. The wide array of fruit, earthy, leathery, floral, herbal, mineral, and woodsy flavour present in wine are derived from aroma notes sensed by the olfactory bulb.

In wine tasting, wine is sometimes smelled before taking a sip in order to identify some components of the wine that may be present.
Different terms are used to describe what is being smelled.
The most basic term is aroma which generally refers to a "pleasant" smell as opposed to odour which refers to an unpleasant smell or possible wine fault.

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Source: Wikipedia · Image: Wikimedia Commons · CC BY-SA 2.0