Moderators use polls for many different reasons.
Example: Give you opportunities to participate and provide feedback. Start a discussion. See how well you understood what they presented.
After a moderator starts a poll you are asked to make a choice. The choices disappear so they don't block anything on the main stage. Select Polling to open the choices again. Select your choice.
You only see the choice you make. Moderators see an overview of the choices made. They can also see the specific choice you and other participants make.They can also see who hasn't responded.
Moderators might choose to show you the overall responses but you never see how anyone else has responded.