In data management, the concept of a key refers to a specific attribute or a combination of attributes that is used to identify, access, and manage data records efficiently within a database or information system. Keys play a fundamental role in organizing data, maintaining accuracy, and ensuring consistency across tables. They help distinguish one record from another and support effective storage, retrieval, and manipulation of data. A key is primarily used to uniquely identify a record in a table. For example, in a database table containing student information, attributes such as roll number or registration number can serve as keys because they uniquely represent each student. Without keys, it would be difficult to differentiate between records, especially when multiple records contain similar or identical data values. Thus, keys ensure uniqueness and prevent ambiguity in data identification. Keys also contribute significantly to data integrity. By defining certain attributes as keys, a database system can enforce rules that prevent duplicate