Doppler Ultrasound is a medical imaging technique that uses sound waves to measure the flow of blood in the body. It works by emitting high-frequency sound waves that bounce off moving blood cells. The device then analyzes the changes in frequency of the reflected sound waves to determine the speed and direction of blood flow. This technology is commonly used to assess conditions related to the heart and blood vessels, such as detecting blood clots or monitoring blood flow during pregnancy. It is non-invasive, painless, and provides real-time information, making it a valuable tool in medical diagnostics.