Onions are versatile, bulb-shaped vegetables that belong to the Allium family, which also includes garlic, leeks, and chives. They come in various types, such as red, white, and yellow, each with its own flavor profile ranging from sharp and pungent to mild and sweet. Onions are used worldwide as a base ingredient in countless savory dishes due to their ability to enhance flavor when sautéed, caramelized, or eaten raw. Rich in antioxidants and compounds like quercetin and sulfur, they offer several health benefits, including supporting heart health and reducing inflammation. Despite their strong aroma, onions are a staple in both everyday cooking and gourmet cuisine.