Pet goldfish are small, freshwater fish commonly kept in aquariums or bowls. They are popular due to their bright colors and relatively easy care requirements. Goldfish can live for many years, often reaching ages of 10 to 15 years or more with proper care. These fish thrive in clean water and require a balanced diet of fish flakes or pellets. It's important to provide adequate space and filtration to keep them healthy. Goldfish come in various breeds, each with unique shapes and colors, making them a delightful addition to many homes.