A sonogram, also known as an ultrasound scan, is a diagnostic imaging technique that uses high-frequency sound waves to create real-time images of internal organs, tissues, and blood flow. It is commonly used to monitor pregnancy, evaluate abdominal and pelvic organs, assess heart function, and guide certain medical procedures. Sonograms are non-invasive, do not involve radiation, and are generally considered safe. The images are produced by a device called a transducer, which sends and receives sound waves that are then converted into visual images on a screen.