Pectoral fins are paired fins located on the sides of fish and some aquatic animals, such as sharks and rays. These fins play a crucial role in steering, balance, and stabilization while swimming. They can also assist in maneuvering and stopping, allowing fish to navigate through their environment effectively. In addition to their primary function in locomotion, pectoral fins can serve other purposes. For example, some species use them for communication or to help in courtship displays. The shape and size of pectoral fins can vary widely among different species, reflecting their unique adaptations to specific habitats and lifestyles.