1. In computing, an attribute is a specification that defines a property of an object, element, or file. It may also refer to or set the specific value for a given instance of such. For clarity, attributes should more correctly be considered metadata. An attribute is frequently and generally a property of a property. However, in actual usage, the term attribute can and is often treated as equivalent to a property depending on the technology being discussed. An attribute of an object usually consists of a name and a value; of an element, a type or class name; of a file, a name and extension.
2. An attribute is a property of a tuple and describes a property of an entity set. In a relational database model, an attribute is a column of a table.
Each entity has a defined number of attributes (properties) which are clearly distinguished from other entities of the same entity type.
https://en.wikipedia.org/wiki/Attribute_(computing) (1.); http://www.datenbanken-verstehen.de/lexikon/attribut/ (2.)
Author: Markus Jödicke