Already answered by DJSmiley, but yes.
1985: VGA with analog signal to drive the TV style monitors. Not sensible for flat panels (will work if you do digital -> analog conversion on the PC side, a nd then analog back to digital on the monitor. But meh. direct digital to digital is much better.
Then DVI (ignore DVI-A) with just did that. (Not free to use for manufacturers)
Then HDMI (HDMI 1 is DVI + sound, with a smaller plug at he end of the cable. Personally I find the smaller plug a downside) (also not free)