An Identification Number is a unique series of digits or characters assigned to an individual or entity for the purpose of identification. This number helps organizations, such as governments or businesses, to track records, manage accounts, and ensure security. Common examples include a Social Security Number in the United States or a Tax Identification Number used for tax purposes. These numbers are essential in various contexts, including banking, healthcare, and employment. They help prevent fraud and ensure that services are provided to the correct individuals. Overall, an identification number plays a crucial role in maintaining organized and efficient systems.