A question or inquiry: asking someone about something you don't know; also used for the act of questioning (can be a noun or a suru-verb).
授業の最後に質問はありますか？
Any questions at the end of the class?
会議で多くの質問が出た。
Many questions were raised at the meeting.
質問の意図をもう少し詳しく説明してください。
Please explain the intent behind your question in more detail.
分からない点は遠慮なく質問してください。
Don't hesitate to ask questions about anything you don't understand.