Identification numbers are unique sequences of digits or letters assigned to individuals, organizations, or items for the purpose of identification. These numbers help distinguish one entity from another and are commonly used in various systems, such as government databases, financial institutions, and healthcare. Examples include Social Security Numbers, Employee ID Numbers, and ISBNs for books. These numbers serve multiple functions, including tracking, record-keeping, and ensuring security. They help streamline processes by allowing quick access to information associated with the number. For instance, a bank account number allows a bank to manage accounts efficiently and securely.