The website lets you create polls, which are intended to be used live in front of a large audience. The presenter can configure the poll, select display options, and mark correct answers.
During the presentation, the presenter has a view, which shows the live results of the poll. The audience can join the polls and vote on them live. The results are completly anonymous.
It can be a great tool for interactive PowerPoint presentations, for lectures, or generally for trivia events.