Software as a Medical Device (SaMD) refers to software or mobile apps intended to treat, diagnose, cure, mitigate, or prevent disease. SaMD has key characteristics like fast feedback loops, improved health outcomes through data collection, and the ability to quickly solicit user feedback and drive innovation. The FDA designates four categories of SaMD based on their intended use and the significance of the information they provide for clinical management and treatment. Common applications of SaMD include screening, diagnosis, monitoring patients, and managing chronic conditions and diseases.