Entitys

An entity is something with distinct and independent existence that can be identified separately from other things. The plural form "entitys" is a common misspelling; the correct plural is "entities".

In database design and information systems, an entity represents a real or abstract object about which data can be collected. An entity type defines a class of objects, and each instance corresponds to a specific object. Attributes describe properties of the object, and a primary key enforces entity integrity by ensuring each instance is uniquely identifiable.

In knowledge representation and data modeling, entities are the nodes of graphs or models. They can be concrete objects or abstract concepts, connected by relations to other entities. Ontologies and semantic models define classes, properties, and constraints that describe what entities can be and how they relate.

In linguistics and natural language processing, named entities are proper names of people, organizations, locations, dates, and other categories. Named-entity recognition is the task of locating and classifying these units in text.

In business and law, an entity may refer to a corporation, partnership, government body, or other legally recognized unit that can own property, enter contracts, and sue or be sued. The concept of an entity across disciplines emphasizes identifiable units that can be described, related, and analyzed within a formal framework.