A question mark is a punctuation symbol that indicates an inquiry or uncertainty. It is represented by a curved line that ends with a dot, resembling a hook. In written language, it is placed at the end of a sentence to show that the sentence is a question, prompting a response or further thought. In English, the question mark is used in various contexts, such as in direct questions like “What time is it?” or in indirect questions like “I wonder what time it is.” It is an essential part of grammar, helping to clarify the intent of the sentence and guide the reader's understanding.