Whats A Good Hdmi Receiver What Is The Point Of Having An HDMI Video Input And An HDMI Video Output On My Receiver?

What is the point of having an HDMI Video Input and an HDMI Video Output on my Receiver? - whats a good hdmi receiver

My Onkyo has a video input and HDMI video output ... I still have an optical fiber of my HD-DVD player, an audio receiver to get in touch, there is no audio input or HDMI output. What is the purpose of the input and output HDMI? I had my DVD player directly to the TV via HDMI and audio through the receiver via the optical fiber. Why does my receiver has HDMI video input and output function?