In database terms, what are attributes?

Attributes in a database context refer to the properties or characteristics of entities. Each entity, which can be thought of as a distinct object or concept within the database, has specific attributes that define its quality or nature. For example, in a database representing a library system, a "Book" entity might have attributes such as Title, Author, ISBN, and Publication Year. These attributes help to identify and describe the information related to that entity, providing a more detailed understanding of the data being stored.

Attributes are essential for organizing data effectively and ensuring that the database can capture all relevant information about each entity. While the other options present concepts related to databases, they do not accurately define attributes. For instance, unique identifiers are known as primary keys, relationships pertain to how different entities are connected, and the structure of the database relates to the overall schema rather than individual attributes.