This section provides an overview of the concept of q&A and introduces the challenges in implementing KBQA, followed by an introduction to the mainstream approaches to Q&A. This section provides an overview of the concept of q&A and introduces the challenges in implementing KBQA, followed by an introduction to the mainstream approaches to Q&A. This section provides an overview of the concept of q&A and introduces the challenges in implementing KBQA, followed by an introduction to the mainstream approaches to Q&A.