Fin rays are bony structures found in the fins of many fish species. They provide support and shape to the fins, allowing for better movement and stability in the water. Fin rays can be classified into two types: soft rays, which are flexible and made of cartilage, and spiny rays, which are stiff and bony. These structures are crucial for a fish's swimming ability, helping them to steer, stop, and maintain balance. The arrangement and number of fin rays can vary significantly among different species, contributing to their unique swimming styles and adaptations to their environments, such as coral reefs or open ocean.