Lavender is a flower with a distinctive light purple color and its own unique aroma, which is often used in potpourris, perfumes, lotions, and other household scents. Although the smell is lovely, lavender also has a unique flavor as an herb, with notes of citrus flavor balanced with a vegetable flavor similar to green tea. Some say it reminds them of the herb rosemary.
Since it pairs well with dairy ingredients like butter and cream, lavender is often used in dessert recipes, as in ice creams and cake frostings. There's no reason it can't be used for savory dishes, though.
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