What is an HDMI input?

A HDMI input is a "high def" input that includes audio - the older DVI was only video.
Using a HDMI input allows you to go digital out on the cable box or DVD player directly digital in to the TV, bypassing the analog transfer if you go any other way.
It also adjusts the aspect ratio of the picture automatically, a very nice feature.

Aspect ratio and resolution!

Kal

Fatparrot
You are not alone,I need to catch up on this home theater new staff as well.I am a two channel guy also.Guys thanks for the explanation,I had no clue either.
George

Hdmi is the future including the upcoming hi res dvd format/s.
Dvi was/is just a temporary connection...and HDMI does 10-12 bit video were DVI is restricted to 8 bit.
Always choose HDMI at this point on any new purchase if the option is there imo.

If I may blow some horn, I explain a bunch of terms for exactly this purpose at www.GreatHomeTheater.com, my website - it's written for those who don't know these things.

Something to keep in mind is that the HDMI interface supports HDCP which is copy protection. Without it you might just find yourself being DOWN-RESOLUTIONED by the evil forces of copy protection into a less than optimum picture. So that's a key consideration.