This UML Sequence Diagram for Online Shopping is an interaction diagram that depicts the flow of objects and messages through the system. Furthermore, this diagram assists software engineers and developers determine what an online shopping system should look like and describes the existing process. The table displays the project name and the online shopping system's sequence diagram details. It contains all of the project's details. The Online Shopping System Sequence Diagram depicts the scenario and the messages that must be passed between objects. It's a flowchart that shows how activities are carried out, including when and how messages are sent.