Inaudible sounds are sounds that are too quiet or at a frequency that the human ear cannot detect. These sounds can include very low-frequency noises, such as those produced by some animals or natural phenomena, and very high-frequency sounds, like those made by certain electronic devices. Inaudible sounds can also be used in various technologies, such as ultrasound in medical imaging, which operates at frequencies above the human hearing range. Additionally, some animals, like dogs and bats, can hear sounds that humans cannot, allowing them to communicate and navigate in ways that are undetectable to us.