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.|
|2.||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.|
|7.||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).|
|11.||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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