Some topics have a Q&A format. Why and how are they different than regular topics?
The Q&A format lends itself well to topics where people are going to submit questions* and makes it easy to track and make sure everything gets answered rather than something missed in a wall of text.
If you have a question you submit a new question. If you have an answer you click Answer this Question and people can rate best answers.
* AMA, Tec Support, etc.