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Entity-Relationship diagram (ERD)
subject			fact

Entity-Relationship diagram	does not show inheritance
	does not show operations
	is a subtopic of 5.7 - Detailed Example: A Class Diagram for Genealogy
	is abbreviated as ERD
	is used by database designers
	is a kind of diagram
diagram	has advantages it conveys or summarizes complex concepts or mechanisms more easily than other techniques
	has problems can be hard for users to interact with or interpret not usable by blind people it can be expensive to program diagram drawing software
	should have a label if its meaning is not obvious, using a caption or pop-up label that appears when the user moves the mouse over it

Kinds of Entity-Relationship diagram :

• Extended Entity-Relationship diagram (4 facts) (EERD)