DVI-D
The most common digital-video cable for HDTV is DVI-D. (DVI stands for digital video interconnect, and the extra D means it’s for digital TV.)
If you’re using DVI-D connections, watch out for two problems:

Not all DVI connectors work with HDTV. Make sure you have DVI-D cables if you use DVI-D in your HDTV system.