Unique identifiers are specific codes or numbers assigned to individual items, people, or entities to distinguish them from one another. These identifiers ensure that each item can be accurately tracked and referenced without confusion. For example, in the context of databases, a Social Security Number or a Customer ID serves as a unique identifier for individuals, allowing organizations to manage records efficiently. In technology, unique identifiers are crucial for data management and security. They can be found in various systems, such as ISBNs for books or UUIDs (Universally Unique Identifiers) in software applications. By using unique identifiers, businesses and systems can avoid duplication and maintain data integrity.