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Enhance the site so that visitors can directly interact with it or among each other, enabling things like user-generated content, comments, voting, chat, or forms for data collection and interaction.
Answers enables the implementation of a Question & Answer system in a Drupal site. Users can post questions and other users can answer them. To see it at work (based on the most recent 7.x-4.x-dev version), head over to its Demo site and have a look at the Questions there.
Enables "pro" and "con" argumentation on content, which makes it easy to compare different arguments and views on a subject. A good example is a debate on a poll.