An ultrasound scan is a medical imaging technique that uses high-frequency sound waves to create images of the inside of the body. It is commonly used to examine organs, tissues, and blood flow, and is especially well-known for monitoring the development of a fetus during pregnancy. The procedure is non-invasive and does not involve radiation, making it a safe option for both patients and healthcare providers. During the scan, a small device called a transducer is placed on the skin, which emits sound waves that bounce off internal structures. The returning echoes are then converted into images displayed on a monitor. Ultrasound scans are often used in various medical fields, including obstetrics, cardiology, and abdominal imaging.