Doppler ultrasound is a medical imaging technique that utilizes the Doppler effect to assess blood flow within the body. Named after Austrian physicist Christian Doppler, this non-invasive procedure is commonly employed to examine blood vessels, particularly in the context of cardiovascular and obstetric care. By emitting high-frequency sound waves and analyzing the echoes produced as they bounce off moving blood cells, Doppler ultrasound allows healthcare professionals to visualize and quantify the velocity and direction of blood flow. This information is crucial for detecting abnormalities such as blood clots, narrowing of vessels, or assessing the well-being of a developing fetus during pregnancy. Doppler ultrasound has become an indispensable tool in modern medicine, offering valuable insights into circulatory dynamics and contributing to the accurate diagnosis and management of various medical conditions. Its non-invasiveness, real-time capabilities, and wide range of applications make Doppler ultrasound an integral part of medical imaging technology.