At an interview.
During a sales pitch.
Throughout a press conference.
When you're getting to know someone better.
The purpose of a question is to learn. It's a chance for you to talk about something you care about. Often times the questions are the wrong type of questions. That's okay. Go ahead and answer a different one. The person asking the question just want's to say something to get you talking. It's up to you, if the question isn't right, to point the conversation in a different direction. The audience will still listen. They want to hear what you have to say. Otherwise, they wouldn't have bothered asking.
The purpose of a question is to learn. The purpose of your answer is to inform. Don't just talk about things you know, but also give a glimpse into who you are. Keep your answers interesting, exciting, and engaging.