The DCM file extension stands for Digital Imaging and Communications in Medicine. It is the international standard for transmitting, storing, retrieving, printing, processing, and displaying medical imaging information. Developed by the National Electrical Manufacturers Association (NEMA) and the American College of Radiology (ACR), it is used globally in healthcare facilities to manage images from various modalities, including CT scans, MRIs, ultrasounds, X-rays, and PET scans. A DCM file is unique because it contains not only the image data but also a header that stores critical metadata about the patient, such as their name, ID, birth date, and the specific parameters of the medical procedure. This ensures that the medical data remains permanently linked to the patient's identity and clinical context. The format supports various compression algorithms and can store multiple frames to represent time-sequenced data or 3D volumes. Because of its complexity and the sensitive nature of the data it contains, specialized software is typically required to view and analyze these files correctly while maintaining diagnostic quality and ensuring data integrity across different medical devices and systems.