How do elephants use their trunks for communication?

Elephants use their trunks to communicate in several ways. They produce low-frequency sounds, or infrasound, that travel long distances and allow them to communicate with other elephants over vast areas. The trunk is also used for tactile communication; elephants touch each other with their trunks to convey affection, reassurance, or even dominance. Additionally, elephants use their trunks to make warning signals, such as trumpeting, and to create vibrations that others can feel through the ground.