Sequence diagrams show how objects interact with each other and in what order these interactions take place.
A sequence diagram shows object interactions arranged in time sequence. It depicts the objects and classes involved in the scenario and the sequence of messages exchanged between the objects needed to carry out the functionality of the scenario.
The line showing the length of time an object exists in the process is known as the lifeline.
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Task1: Create a sequence diagram for an auction website. (e.g. eBay)
Task 2: Create a sequence diagram for a social network. (e.g. Facebook)
Task 3: Create a sequence diagram for a game of Pacman.