Sweet onions, also known as Vidalia onions, Walla Walla onions, or Maui onions, are a type of onion known for their mild and sweet flavor. They have a high sugar content and low sulfur content compared to other onion varieties, resulting in a mild taste and less pungent aroma. Sweet onions typically have a yellow or pale golden skin and a crisp, juicy texture. They are popular for both raw and cooked applications, adding sweetness and depth of flavor to a variety of dishes.