Color Doppler is a medical imaging technique that uses ultrasound waves to visualize blood flow in the body. It works by emitting sound waves that bounce off moving blood cells, allowing healthcare professionals to assess the speed and direction of blood flow. The resulting images are color-coded, with different colors representing the flow towards or away from the ultrasound probe. This technique is commonly used in cardiology to evaluate heart conditions, as well as in obstetrics to monitor blood flow in the placenta and fetus. By providing real-time information, Color Doppler helps doctors make informed decisions about patient care.