UML 2.4 has 14 types of diagrams divided into two categories: Structure diagrams and Behavior diagrams.
Structure diagrams show the static structure of the system and it's parts on different abstraction and implementation levels and how they are related to each other.
Structure diagrams are:
Behavior diagrams show the dynamic behavior of the objects in a system, which can be described as a series of changes to the system over time.
Behavior diagrams are:
Sequence diagram, Communication diagram, Interaction overview diagram, and Timing diagram are Interaction diagrams.
Note, that though Use case diagram is Behavior diagram, it is also special case of Class diagrams (which are Structure diagrams).
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UML 2.3 and the more recent UML 2.4 has 14 types of diagrams: 7 structure diagrams and 7 behavior diagrams. See the overall hierarchy and description of each type in the provided link.
Diagrams, blueprints, maps, layouts, floor plans
graphical representations
An advantage to using graphs and diagrams in presentations is that it is easy for your audience to see what you are describing. Graphs and diagrams help get your point across.
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