Dolphins are aquatic mammals belonging to the cetacean family, which also includes whales and porpoises. They are known for their intelligence, social behavior, and playful nature. Dolphins communicate using a complex system of clicks, whistles, and body language, and they often live in pods, which are social groups that can vary in size. They are highly adaptive and can be found in various ocean habitats, from shallow coastal waters to the open sea. Many species of dolphins are also known for their acrobatic displays and ability to work collaboratively when hunting.