What AI algorithms are used by D-ID?

Hello, I am carrying out research for an undergraduate project and would like to know more about the artificial intelligence algorithms used by D-ID. I will present your services for creating the avatar and animating the photo to my professor and colleagues, but I also have to specify which algorithms are used, without going into details. Could you tell me which AI technologies or algorithms are implemented to provide your services? Thank you in advance for your help!