ENTITY
An Entity is a real world object having characteristics
TANGIBLE ENTITY
An Entity having Physical Existence
INTANGIBLE ENTITY
An Entity exists Logically but dont have physical existence
ENTITY SET
Group of Entities having same attributes
ENTITY TYPE
An Entity set representing with a name called Entity Type
STRONG ENTITY TYPE
An Entity Type having key attribute
WEAK ENTITY TYPE
An Entity Type doesn't have key attribute
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