There are 3 different types of polls, depending on the visibility the participants have of other participants votes:
Open: all participants can see who and what has voted during the launched poll.
It is a public poll.
Blind: during the poll, participants can only see how many people have already voted.
When the poll is over, the Presenter can decide wether if to share or not the results with them.
Anonymous: no participant, not even the presenter at the end of the poll, can see who has voted what.
It shows percentages only.