MRI scan is a non-invasive radiology technique that uses magnetism and radio waves to produce detailed images of the body's internal structures. It provides information that cannot be seen using other imaging methods like x-rays and CT scans. MRI is useful for diagnosing various medical conditions, such as heart and brain abnormalities, injuries to joints or pelvis, and liver diseases. The document provides information on how MRI works, its benefits over other scans in not using radiation, and some common uses to assess different parts of the body.