Thanks for your question!
Senators are elected by the people in their state or territory to represent them in the Senate. Senators discuss state, territory and national issues, debate and vote on bills—proposed laws—and scrutinise—closely examine—the work of the Australian Government ideas and plans. To do this, they sometimes need to move a motion—an idea put forward for consideration, debate and decision.
The purpose of moving a motion may be to allow different topics to be heard and discussed in the Senate. It also allows senators to speak up about the concerns and views of the people in their state or territory. Although senators may know a motion will fail because a majority of senators do not support it, it is still seen as an important part of the process of representation, law-making and scrutinising government decisions. These are all important roles of the Australian Parliament.