attributs

An attribute is a property or quality that describes an entity. Attributes are used to characterize, identify, or classify objects, individuals, events, or data items. They can be qualitative or quantitative, and they may be intrinsic or situational.

In philosophy and ontology, attributes correspond to properties that something possesses. A distinction is sometimes drawn between intrinsic attributes (belonging to the thing itself) and extrinsic attributes (dependent on the thing’s relations to other things). Some theories also distinguish essential attributes from accidental ones.

In logic and computer science, attributes are unary predicates or properties that apply to objects. In linguistics, adjectives and other modifiers can function as attributes that describe nouns or noun phrases, shaping how a thing is perceived or categorized.

In computing and data contexts, an attribute is a named data item associated with an entity. In relational databases, an attribute is a column; in object-oriented programming, attributes are fields or properties of objects. In HTML, attributes are name-value pairs that convey additional information about an element. In data modeling, attributes have domains and constraints, and they participate in schemas that define the structure of data.

In metadata and machine learning, attributes (often called features) are measurable properties used to describe and analyze data, build models, or perform classification and prediction. Across disciplines, the common idea is that an attribute is a describable property that helps identify, distinguish, or reason about a subject.