Digital video? What does Wikipedia have to say about that? Oh, Wikipedia has a pretty good and interesting history section on the subject.
20180826/https://en.wikipedia.org/wiki/Digital_video
Again, I reiterate, because this is important! Yes, indeed it is serial digital interface (SDI) that is not found on most consumer equipment because it is uncompressed, and various licensing agreements often prohibit the use of uncompressed video signals for consumer use.
20180826/https://en.wikipedia.org/wiki/Serial_digital_interface