A poll is used for voting. You can create whatever options (answers) you want along with the question to go along with them.

A topic with a poll works just like a normal topic. The only difference is there are the poll questions on the top of the topic. Members can still make replies to the topic.

You can create a new poll (if you have the proper permissions to do so) by clicking on the New Poll button inside of a board. You can also add a poll to an existing topic by clicking on the Add Poll button on the bottom of a topic.

For more information about all of the options in a poll see Poll Options.