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Ultrasound refers to sound waves with frequencies higher than the upper audible limit of human hearing. It is generally considered to be frequencies above 20,000 Hz. These high-frequency sound waves are not audible to the human ear but can be used in various applications.

Ultrasound has many uses across different fields, including the following: 1. Medical Imaging: In medicine, ultrasound is widely used for imaging purposes. By emitting ultrasound waves into the body and detecting the returning echoes, medical professionals can produce real-time images of internal organs and structures. This technique is called ultrasonography and is useful for diagnosing various health issues and monitoring the development of fetuses during pregnancy. 2. Therapeutic Ultrasound: Ultrasound can also be applied in physical therapy for the treatment of various musculoskeletal conditions, such as tendonitis, muscle strain, and joint pain. It works by using sound waves to generate heat and stimulate the tissue's healing process. 3. Industrial Applications: Ultrasound plays an essential role in industrial settings as well. It's used for detecting defects in materials, measuring thickness, sensing fluid levels, and even cleaning delicate objects without damaging them. 4. Sonar Systems: In navigation and detection, ultrasound is used in sonar systems. These systems emit sound pulses underwater and determine the location and distance of underwater objects based on the echoes received. 5. Pest Control: Ultrasonic pest control devices produce high-frequency sound waves that are intolerable to rodents and insects, driving them away. In summary, ultrasound refers to high-frequency sound waves that are beyond the range of human hearing. Ultrasound has a wide range of applications, including medical imaging, therapeutic treatment, industrial processes, sonar systems, and pest control.