The cashew nut is served as a snack or used in recipes, like other nuts, although it is actually a seed. The cashew itself has a slight yellow tinge, and is in the shape of a slight crescent (Wikipedia, nd).
Along with walnut, almond and other tree nuts, cashew allergy is one of the most common food allergies in children and adults. Like peanut, cashew can cause the most severe allergic reactions, even if a person is exposed to small amounts. Cashew cross-reacts with pistachio, so people who have cashew allergy tend to have an allergic reaction to pistachio. Cashew is a hidden ingredient in common foods, such as Asian meals, ice cream and cakes (Livestrong, 2014).
Cashew nuts are a popular snack and food source. Cashews, unlike other oily tree nuts, contain starch to about 10% of their weight. This makes them more effective than other nuts in thickening water-based dishes such as soups, meat stews, and some Indian milk-based desserts. Many southeast Asian cuisines use cashews for this unusual characteristic, rather than other nuts. The shell of the cashew nut is toxic, which is why the shell is removed before it is sold to consumers (Wikipedia, nd).
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Here is an article about the benefits of consuming cashews.