UML sequence diagrams - What are the various components in sequence diagrams?

What are the various components in sequence diagrams?

Actor: Actor represents an external user / end user who interact with the system.
Object: Object is represented by one of components of the system.
Unit: A unit is a subsystem, or a sub component or other entity within the system.
Separator: Separator represents a boundary among sub systems, components or units.
Group: Represents different header elements in the subsystem.
UML deployment diagram - What are the parts of a deployment diagram?
UML deployment diagram - What are the parts of a deployment diagram? - Nodes: A node represents any hardware component. The configuration of hardware is represented by attributes of nodes......
UML collaboration diagram - What are the different elements of a collaboration diagram?
UML collaboration diagram - What are the different elements of a collaboration diagram? - Object: The interaction between objects takes place in a system. .
UML activity diagrams - Brief explanation of all elements in activity diagrams.
UML activity diagrams - Brief explanation of all elements in activity diagrams. - Activities: An activity indicates an action that performed in the system.....
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