a question added at the end of a sentence
a short one tagged onto the end of a statement to ask for confirmation of it
a short question added to the end of a positive or negative statement
a short question at the end of a sentence
a statement followed by a type of reduced question (e.g., You saw him that day, didn't you?).
Tag questions (or: question tags) are a grammatical structure in which a declarative statement or an imperative is turned into a question by adding an interrogative fragment (the "tag").