Difference between UML and ER diagram

1. Unified Modelling Language (UML) :
UML is a modelling language that visually represents a software system.

2. ER Diagram :
ER diagram is a pictorial representation of the real-world entities and their relationships with each other.

Difference between UML and ER Diagram:

S. No. CATEGORY UML ER diagram
1. Full Form UML stands for Unified Modelling Language. ER Diagram stands for Entity Relationship Diagram.

Definition It is a general modelling language which is used to visualize the design of a software system. It is a pictorial representation of the real-world entities and their relationships with each other.
3. Relationship It is the parent of ER diagram. It is the child of UML.
4. Use It is used to design the entire software. It is used to design only the databases.
5. Scale It is mainly used in case of large-scale software development. IT can be used in case of database development of all scales.
6. Components It has use cases and workflows. It has entities, attributes and relationships.

Diagrams involved It involves use case diagrams and activity diagrams. It is itself involved in representation.
8. Primary User It is used by developers to understand flow of program. It is made for the understanding of Stake holders and enterprise owners, to understand that their requirements have been correctly met.
9. Depiction Flow of control is depicted. Relationships are depicted.
10. Modelling It is a form of dynamic modelling as it can depict what activities are being performed at what time. It depicts static modelling (as unlike UML it does not depict state of the activities).

States It involves a final and an initial state. It has no state representation.
12. Shapes used It is uses circles, rectangles with round corners, arrow heads, diamonds, rectangular bars etc. It uses only 3 shapes (oval, rectangle and diamond).
13. Use of swimlanes It uses swimlanes. It does not use swimlanes.
14. Time It can represent time taken during activities. It does not depict time.
15. Types It is of 2 types, Structural UML diagrams and Behavioral UML diagrams It does not have types, however, it contains entities, relationships and attributes each of which have several types.

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