1 INTRODUCTION

2 BACKGROUND  
2.1 Task Formulation  
2.2 Datasets for Facial Forgery Detection  
2.3 Evaluation  
2.4 History and Challenges of Deepfake Datasets  

3 METHOD  
3.1 Single-modal Detection  
3.2 Multi-modal Deepfake Detection  

4 CHALLENGES AND FUTURE DIRECTIONS  

5 CONCLUSION