Aquarium fish are species of fish that are kept in home or public aquariums for decorative and educational purposes. They come in various shapes, sizes, and colors, making them popular among hobbyists. Common types include goldfish, betta fish, and neon tetras. Proper care involves maintaining water quality, temperature, and feeding them a balanced diet. These fish can be freshwater or saltwater species, each requiring different environments. Freshwater aquariums are generally easier to maintain, while saltwater aquariums often feature more vibrant and diverse marine life. Understanding the specific needs of each species is essential for their health and longevity.