Dog tags are small, flat metal plates worn by military personnel to identify them in case of injury or death. They typically contain important information such as the service member's name, social security number, blood type, and religious preference. This information helps medical personnel provide appropriate care and notify next of kin. In addition to military use, dog tags have become popular as fashion accessories and personal identification for civilians. Many people customize their dog tags with names, quotes, or symbols, making them a unique way to express individuality or commemorate special events.