Tag questions are short questions added to the end of statements to check for confirmation or agreement. They usually use an auxiliary verb and pronoun like "didn't he?" or "won't she?". The question tag follows the same rules as the statement - positive statements use negative tags and vice versa. Common question tags are "aren't there?", "isn't it?", "won't it?", "didn't you?", and "don't they?". Examples are provided to demonstrate how to form question tags with different statements.