A question mark replaces a period at the end of a sentence when the sentence is a question. Sometimes, question marks are known as interrogation points.
Question words like who, when, where, why, what, which, and how indicate that a sentence is a question. If your sentence begins with one of those words, then it is most likely a question and should be ended with a question mark.
A question mark indicates to your readers that your sentence should be read as a question.
Rule #1: You don't need to use a question mark in conjunction with other ending punctuation, like a period or an exclamation point.
Rule #2: You should always capitalize the first letter the word directly after a question mark.
Rule #3: If you're writing a quoted question, you should put the question mark within the quotation marks.
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