Sweet onions are characterized by their mild taste, lacking the sharpness of other onions. They have a high sugar content, contributing to their sweet flavor profile, and their texture is crisp and juicy. Sweet onions are typically larger and flatter than regular onions, with a golden or light brown papery skin. They are popular for eating raw in salads or on sandwiches due to their pleasant taste and low pungency, making them a versatile choice in various culinary applications.