Pistachios are a type of nut that is native to the Middle East and Central Asia. They are small, green nuts with a distinctive shape and a hard, outer shell that splits open when the nut is ripe. The inner kernel of the pistachio is edible and has a sweet, nutty flavor. Pistachios are a popular snack food and are often eaten on their own or used as an ingredient in a variety of dishes and baked goods. They are a good source of protein, fiber, and various vitamins and minerals. They may also have health benefits, such as improving cholesterol levels and helping to reduce the risk of heart disease.