Which of the following best describes the function of a torpedo?

A torpedo is best described as a self-propelled underwater missile primarily designed to target and destroy enemy ships or submarines. Unlike traditional projectiles that are fired from a surface vessel, torpedoes are launched into the water and are capable of navigating through the underwater environment autonomously. They are equipped with their own propulsion systems and guidance mechanisms, allowing them to travel towards their target with a high degree of accuracy.

Additionally, torpedoes typically contain explosive warheads that detonate upon impact or at a predetermined depth, making them highly effective for naval warfare. The other options do not accurately reflect the operational characteristics of a torpedo, showcasing why the correct understanding of its function emphasizes its unique role and capabilities in maritime combat situations.