DICOM stands for Digital Imaging and Communications in Medicine. It's a way of saving and sharing medical images (like X-rays, CT scans, and ultrasounds) and other types of medical information. Hospitals and doctors use DICOM to store, edit, and share medical images, so they can all be seen on one system. That way, the doctor can look at different images at the same time to understand a patient's health, and share them with other doctors or hospitals.