Ultrasound, also known as sonography, is a diagnostic imaging technique that uses high-frequency sound waves to create images of the internal organs, tissues, and blood flow in the body. It is a safe, non-invasive, and commonly used procedure during pregnancy to monitor the growth and development of the fetus.

Apart from obstetric uses, ultrasound is also widely employed to evaluate the abdomen, liver, kidneys, heart, thyroid, and other soft tissues. It helps in detecting abnormalities such as cysts, tumors, fluid collections, and more. The procedure is painless and does not involve radiation exposure.