Diving signals are hand gestures used by divers to communicate underwater, where sound is limited. These signals help convey important messages, such as indicating the need to ascend, descend, or signal an emergency. Common signals include the thumbs-up for ascending and the thumbs-down for descending. Divers often use these signals in conjunction with dive buddies to ensure safety and coordination during a dive. Understanding and practicing these signals before diving is essential for effective communication, especially in challenging underwater environments where visibility may be poor.