Identification numbers are unique sequences of digits or letters assigned to individuals, organizations, or items to distinguish them from others. Common examples include Social Security Numbers (SSNs) for individuals, Employee Identification Numbers (EINs) for businesses, and International Standard Book Numbers (ISBNs) for books. These numbers help streamline processes like record-keeping, tracking, and verification. These numbers serve various purposes across different sectors. For instance, in finance, bank account numbers help identify accounts, while in healthcare, patient identification numbers ensure accurate medical records. Overall, identification numbers play a crucial role in maintaining order and security in various systems.