Fancy goldfish are a popular type of aquarium fish known for their unique shapes, vibrant colors, and distinctive fin structures. They are a domesticated variety of the common goldfish, which is scientifically classified as Carassius auratus. Fancy goldfish come in various breeds, including Oranda, Ranchu, and Bubble Eye, each with its own specific traits and care requirements. These fish are typically kept in home aquariums or outdoor ponds and can live for many years with proper care. They thrive in clean water with stable temperatures and benefit from a balanced diet. Fancy goldfish are social creatures and often enjoy the company of other fish, making them a delightful addition to aquatic environments.