What is "tag question"

n. (context grammar English) A question inviting the listener to indicate agreement, formed by adding a “tag” word or expression to a statement. For example “You love me, don’t you?”.

A question tag or tag question (also known as tail question) is a grammatical structure in which a declarative statement or an imperative is turned into a question by adding an interrogative fragment (the "tag").For example, in the sentence "You're John, aren't you?", the statement "You're John" is turned into a question by the tag "aren't you". The term "question tag" is generally preferred by British grammarians, while their American counterparts prefer "tag question".