Speaking of the word "concession", everyone should be familiar with it, because there are adverbial clauses in English grammar knowledge system. In IELTS argumentative writing, concession is to take a step back, admit the facts or opinions you disagree with, and then refute them. For example, everyone has had interview experience to some extent, so we can make an analogy.

Usually, after the interview, if HR refuses to hire us, he will properly affirm some of our highlights before refusing, which is concession. Of course, after the affirmation, HR will still come straight to the point, criticize us and ruthlessly reject us. In the process of writing the main paragraph, the content of concession is expanded into a paragraph, which is what we call concession paragraph.