Definition: - Entity is a thing in the real world with an independent existence. Entity is the basic component of ER diagram. An entity may be an object with a physical existence (for example a particular parson, car, house, or employee) or it may be an object with a conceptual existence (for example a company, job, or university course). The graphical representation of entity is a rectangle for example person and city both are the entities in above ER diagram.
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