A wise man can learn more from a foolish question than a fool can learn from a wise answer. Bruce Lee
Is a question always asking for an answer, information, etc.? In most conversations and social interaction the answer should be yes. Sometimes when you argue with someone you might use questions that are spelled (or yelled) out as statements rather than questions even if you voice flows in the same way, as it should if you asked someone for the salt. But the use of questions is much more diverse than you might first think. My own interest in asking questions has grown from people close to me asking questions even though the do not want an answer that does not fit with what they already has decided is the answer. The question is asked out of some form of guilt or have-to-ask-fixation. A question can of course also be asked out of politeness. This will or might be misinterpreted if the social codes of interacting in these situations, what the correct answer to the question should be, are not spelled out or agreed upon. Asking a question as part of social interaction is different from the use of rhetorical questions since a rhetorical question is used to make a point, a statement rather than interact in conversation. A friendly asked question made as part of a conversation beg for an answer. The answer can be one that you agree or disagree upon but if you already have an answer then you should make a statement rather that mislead the person you are making a conversation with by pretending you care for her/his opinion by asking a question. Growing a caring and exchanging relationship should build on open-mindedness not on playing rhetorical language games.