A question is how we ask things. 

A question is how we ask for info. 

A question is a way to ask for information. 

A question is a special way to speak or write. It is an utterance used to request information from someone else. 

There are many different ways to build a question. One way is to use a polar question. These are also called yes-no questions. You can answer them with a simple "yes" or "no." Another way is to use an alternative question. This type gives a list of choices to pick from. You might ask if someone wants jam or marmalade. You can also ask open questions. These use "wh-words" like who, what, or when. They allow for many different possible answers. This helps people share a lot of new information.
Language experts study questions in many ways. They look at them through linguistics and the philosophy of language. In a field called pragmatics, questions are seen as acts. These acts raise an issue that needs to be solved in a conversation. Some experts look at the rules of how words are put together. This is called syntax. In English, we often change the word order to make a question. We might move a helping verb to the front. This tells the listener that a question is coming.
Different languages have unique ways to mark a question. In English, we often change the order of words. In French, you can also change the word order. Many other languages use a special particle or small word. For example, Japanese uses the word "ka." Mandarin uses the word "ma." Polish uses the word "czy." Most languages also use a change in pitch. This is called intonation. In English, your voice often goes up at the end. This sound helps people know you are asking something.
Writing also uses special marks to show a question. In many scripts, we use a question mark at the end. Spanish is different because it uses two marks. It puts an upside-down mark at the start of the sentence. There is even a rare mark called an interrobang. This combines a question mark and an exclamation mark. 
A question is an utterance used to request information from another person. It is a fundamental tool for human communication and discovery. While people often use the terms interchangeably, linguists distinguish between questions and interrogatives. An interrogative is the specific grammatical form used to express a question. For example, a rhetorical question uses an interrogative form but does not actually expect a real answer. 
To understand how questions work, we can look at them through three different lenses. At the semantic level, a question is defined by its ability to create a set of logically possible answers. At the pragmatic level, a question is an illocutionary act. This means it is a speech act intended to obtain information from the listener. Finally, at the syntactic level, questions are defined by grammatical rules. In English, this often involves subject-auxiliary inversion, where the order of the subject and the helping verb changes. Some sentences, like "I would like to know your name," satisfy the pragmatic goal of seeking information but do not follow the syntactic rules of a question.
Questions are classified into several distinct types based on the answers they allow. Polar questions, also known as yes-no questions, ask whether a specific statement is true. These can be answered with "yes," "no," or similar expressions. Alternative questions provide a list of discrete choices for the listener to select from. For instance, asking "Do you want jam or marmalade?" assumes the answer is one of those two options. Open questions, sometimes called wh-questions, allow for an indefinite number of possible answers. These typically use interrogative words like "who," "what," or "where" to seek unknown information.
There are also specialized ways that people use questions in conversation. A display question is used when the speaker already knows the answer but wants to test the listener. Teachers or game show hosts often use these to check knowledge. Direction questions seek instructions rather than facts, such as asking "When should I open your gift?" Another type is the indirect speech act. A person might ask "Would you pass the salt?" to politely issue a command. Some questions, known as loaded questions, can be used to embarrass someone. These are complex questions where any possible answer implies information the person might not want to admit.
Language structure varies greatly when forming these inquiries. In English, German, and French, speakers often use word order inversion to signal a question. English is unique because this inversion is limited to auxiliary verbs. This sometimes requires adding the word "do," such as changing "Sam reads" to "Does Sam read?" Many other languages use an interrogative particle instead of changing word order. For example, Japanese uses "ka," Mandarin uses "ma," and Polish uses "czy." In the World Atlas of Language Structures, only one language, Atatláhuca–San Miguel Mixtec, was found to have no distinction between statements and polar questions.
Intonation and punctuation also play vital roles in identifying questions. Most languages use a specific pitch pattern, often a rising tone at the end of the sentence. In English, a rising declarative can function as a question through prosody alone. Writing also provides visual cues through symbols. Most scripts use a question mark at the end of a sentence. Spanish is notable for using an inverted question mark at the beginning of the sentence to prepare the reader. 
Questions connect deeply to the fields of linguistics and the philosophy of language. In the subfield of pragmatics, questions are studied as ways to raise issues that must be resolved during discourse. Formal semantics researchers look at questions through alternative or inquisitive semantics. They view questions as the denotation of interrogatives, often identifying them as sets of propositions. By studying how we ask and answer, researchers gain insight into how human beings organize logic and social meaning. Whether through a simple "yes" or a complex inquiry, questions drive the flow of human thought.
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