"who is the speaker of the house and what do they do?"

Thanks (someone’s) mum! The Speaker is a member of the House of Representatives. They are elected by a vote of all the members of the House of Representatives to run the meetings of the House of Representatives.

The Speaker has several responsibilities, including:

The Speaker does not usually participate in debates and only votes if there is a tie. 

More information on the Speaker and their role can be found here and here.

diagram to help explain who is the speaker of the house and what do they do?