Answer :
Final answer:
The labeled arrow between lifelines on a sequence diagram is referred to as a message which signifies the communication sent from one object to another.
Explanation:
In sequence diagram, the labeled arrow between lifelines is referred to as a message. These messages represent communication between different objects in a system which could either be the invoking of methods or procedures, or signal communications. These messages are the core part of sequence diagrams as they define the interactions among the objects over the timeline. An arrow from one lifeline to another signifies a message sent from one object to another.
A labeled arrow between lifelines on a sequence diagram is called a message. In sequence diagrams, messages represent communication between objects or actors in a system. They are used to show the flow of control and data between different parts of the system.
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