Tag questions are a tool from Speechcraft, which is Skill 7 of The 7 Skills to impress™. This can be found in Part 2, Chapter 7 of the book.
Tag questions are short questions added to the end of a sentence. They are used to generate a reflex agreement to a message in our ‘client’ minds.
They include words and phrases such as, “Isn’t it? Don’t you? Right?”