Participants are the message senders. The participants can be defined implicitly as in the example.
Manipulate Participant Order
Participants are presented according to the sequence of their introduction within the diagram's source code. However, there may be instances where a different arrangement is preferred over the one initially depicted by their first mention. To accommodate this, one can explicitly define the order of appearance for the participants by adhering to the steps outlined below:
We can group the participants with group keyword.