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Is entity an instance of class?
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From an object-oriented perspective, an entity object represents an object in the real-world problem domain. From a relational database perspective, an entity object provides a Java representation of data from a database table.
An entity class is essentially an object wrapper for a database table. The attributes of an entity are transformed to columns on the database table.
Whereas an entity type represents an abstract category, an entity instance is a manifestation of an entity within that category.
Examples of an entity are a single person, single product, or single organization. Entity type. A person, organization, object type, or concept about which information is stored. Describes the type of the information that is being mastered.
A class is a template for an object (among other things), and is a very general concept.
An entity has more semantic significance and is usually tied to a concept (possibly about a real object for example, an Employee or a Student or a Music Album) and is linked to business logic.
Entities are usually used to establish a mapping between an object and to a table in the database. Entities are also known as domain objects. Like I mentioned before, entities will be used in situations where there is business logic and as such it hold information about the system (or part of the system) that it is modeling.
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