Answer :
Vertical dashed lines on a system sequence diagram represent a lifeline, which depicts the timeline of interactions and existence of an object or entity in the system through arrows that point to other objects with which it interacts.
A lifeline, often called an object lifeline, is shown on a system sequence diagram as vertical dashed lines. This depicts an item or entity's presence in the system as well as the history showing how it interacts with other objects or entities. The lifeline is represented as a vertical dashed line with arrows indicating in the direction of the things or creatures it interacts with. The arrows reflect the communications or interactions between each lifeline's instances, and each lifeline represents an instance of a class or other item in the system. The lifeline offers a visual depiction of the behaviour of the objects or entities and their interactions across a certain series of system events.
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