What is a "green onion"?

Green onion, also known as scallion or spring onion, is a type of young onion with long, slender green stalks and small white bulbs. They have a mild onion flavor and are commonly used in cooking. Green onions can be chopped and added raw to salads, soups, and stir-fries for a fresh, oniony taste. They can also be cooked briefly to soften their texture and enhance their flavor.