The question mark ? is a punctuation mark that indicates a question or interrogative clause or phrase in many languages.
An 11th century punctus interrogativus; in the third line before "tamen". (Burgerbibliothek Bern, Cod. 162, f. 15r.)
A question is an utterance which serves as a request for information. Questions are sometimes distinguished from interrogatives, which are the grammatical forms typically used to express them. Rhetorical questions, for instance, are interrogative in form but may not be considered bona fide questions, as they are not expected to be answered.
A man asking a woman a question