If the checkbox "Multiple answers possible" is set, endless hooks can be set for the response options of your StrawPoll. If the checkbox isn't, you can only set a response as a vote.
If the checkbox "No Duplication-Check" is set, endless voices can be delivered per IP address. This is, for example, practical when your StrawPoll is created for school, university or work. If the checkbox isn't, just one vote per IP address, so once per household, is possible.
If the checkbox "Private StrawPoll" is set, the access to the StrawPoll is only available with a private invitation-link.