Ultrasound imaging, also known as sonography, is a medical technique that uses high-frequency sound waves to create images of the inside of the body. The sound waves are transmitted into the body through a device called a transducer. The sound waves bounce off the body's internal organs and tissues and return to the transducer, which records the signals and creates a digital image of the body's interior. Ultrasound imaging is often used to diagnose medical conditions, such as pregnancy and heart conditions, and can provide detailed images of organs and other structures in the body.