An attribute whose value uniquely identifies an object is called a(n ) _______.

An attribute whose value uniquely identifies an object is called a primary key. In database management, a primary key is a specific choice of a minimal set of attributes which uniquely specify a tuple (or record) in a relation. The primary key ensures that each record in a table can be distinguished from others without ambiguity, making it crucial for maintaining data integrity and facilitating efficient data retrieval. For example, in a table of users, the user ID can serve as a primary key because each user has a distinct ID. This uniqueness prevents redundancy and allows for optimized indexing and querying of the database.