CompTIA ITF+ Practice Test 2024 - Free CompTIA ITF+ Practice Questions and Study Guide.

An attribute is a characteristics or property of a data entity, which can act as a unique identifier in a database. This differs from the other options as "process" refers to a series of actions, "server" is a computer or device that provides services to other devices, and "input" is data that is entered into a computer. These options do not describe a unique identifier within a database.