**One of the main building blocks of UML - shows attributes and methods of classes, as well as relationships between classes.**
Class Diagrams are primarily a _**structural**_ diagram in UML. It’s probably one of the more widely-used UML diagram types. They show inheritance patterns between classes, and the properties they carry - but also include _some_ behavioral elements as they may also include Class methods.
Class diagram nodes have a compartment for the name, then properties of the class, then its methods.
```mermaid
classDiagram
class libClass
libClass : +String owner
libClass : +getProp()
libClass : +setProp(newValue~string~)
```
They include syntax for property/method visibility:
```
+ Public
- Private
# Protected
~ Package
```
And the arrows linking classes also carry semantic meaning:
For more: see ‣
They are akin to Block Definition Diagrams in [[SysML]].
****
# More
## Source
[Class diagram - Wikipedia](https://en.wikipedia.org/wiki/Class_diagram)
Also just using them in [[Mermaid JS]]
## Related
- [[UML]]
- [[Mermaid JS]]
- [[Diagram Types (index)]]