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From medieval latin you entice, entity it is every community that can be considered as a unity . The concept is often used to name a corporation or company that is taken as a legal entity .

For example: "The Buenos Aires entity declared bankruptcy because it could not assume its financial obligations", “I work for a reputable entity that has a presence in fourteen countries of our continent ”, "The American player became the new signing of the black and white entity", "Hard accusation against the entity chaired by John Smith".

The term, on the other hand, allows us to refer to certain territorial divisions inside a State. A subnational entity it can be a province, a community or a region, among other classifications: provinces of the Argentinian republic , the autonomous communities from Spain , the cantons from Switzerland , the communes from Chile , the departments from Bolivia , the prefectures from Japan , etc.

Entity is also the value or importance of something . In this sense, when a thing has an entity, it has a particular relevance: "The accusation of the minister has no entity and will soon be forgotten", "The word of Dr. Filimenti has an entity within provincial medicine and must be heard", “I will not comment on sayings without an entity that only confuse the population”.

For the philosophy , the entity is what constitutes the essence of a thing . In a broader sense, an entity or entity is something whose existence is recognized by an ontological system. There are specific entities (such as people or material objects) and abstract (properties, possibilities, thoughts).

In computer science, more specifically in object-oriented programming, entity can be defined as a class that has the basic properties of a series of classes that the they happen. Through the heritage, different classes you can take advantage of the properties and methods of the same class mother; Depending on the structure proposed by each developer and the characteristics of each language, it is also possible to take the elements of the main class as the basis for the creation of others, generally more complex or specific.

It is very common to use an entity class to declare properties such as position variables in space, with their respective methods get (to get their values) and set (to store new values ​​in them), which will serve as a basis for a large number of objects. In the context of a video game, for example, both an object of type enemy as another type main character They can make use of the same entity class, although both require their own classes to define their particular methods and properties.

In the field of bases of data, the representation that is made of a concept or an object of the real world in the base itself is known as an entity. Every entity must be described in the database structure (the set of tables and fields with their respective types of data, their relationships and restrictions, such as the rules to preserve the integrity of the data or to avoid its redundancy), following a certain model (a set of concepts used to describe the structure).

If an example is taken as an company of services, it can be said that one of the entities in your database will surely be Client, which, in turn, will consist of a series of attributes, such as first name, surname, phone number and Email address. In turn, according to the model of relationship entity, it is possible to distinguish between entities powerful (those that have the key attributes) and weak (which depend on the key attributes of the former).

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