Ultrasound is a medical procedure that uses sound waves to create images of the inside of the body. It is used in the assessment of a variety of conditions, including pregnancy, heart disease, and organ damage. The ultrasound probe is placed on the skin, and the sound waves bounce off the structures inside the body. The image is then displayed on a monitor, providing information about the size, shape, and location of the structures. Ultrasound is a safe and painless procedure that can be used to diagnose a variety of conditions.