Yes of course, it's in the specification for HDCP.
Only HDTVs have HDMI cable inputs
Most do, you would have to check the TV to make sure. HDMI has all but eliminated the need for RGB or component video.
When the Xbox 360 first came out, there was no HDMI slot at all. After the release of the Elite (black Xbox 360), they introduced HDMI. After that, I believe all Xbox 360's was introduced with the slot. Basically, if you have the first Xbox 360 then no.
HDMI is a connection plug on the back of HDTVs to allow other devices to be connected to the HDTV. Before HDMI they used S Video and Component connections to connect devices
yes if that certain model of the tv. has hdmi plugins in the back or on the side
1080p is possible though component but HDMI is the best way for HD content. It is very unlikely there are HDTVs which do support 1080p but don't have HDMI.
It's in the back of your xbox 360.
yes
No. Blu-Ray players require an HDMI cable to hook up to a TV and only HDTVs accept HDMI cables
Yes, as long as your Epson projector has an HDMI slot, or if you use an HDMI-to-VGA adaptor (an HDMI-to-RCA Video adaptor can work as well).
no you do not have to have an hdmi for ps3 but i would recommend it to play your games in hd because hdmi stands for hi-definition multimedia interface. The HDMI cable is for the PS3 to connect to HDTVs and is not needed for standard TVs which do not even have HDMI inputs. If your TV has HDMI inputs you need to purchase a HDMI cable before you spend your money on a new game, Movie, download or anything else because it is not giving you a picture from the PS3 in HD
The HDMI cable should be plugged in to an HDTV. If you have a Laptop or PC with a HDMI plug slot on it is also so it can be plugged in to a HDTV and is an out HDMI PLUG SLOT like the one that is on the PS3. Some HDMI cables that are sold are of low quality and do not work, stick with brand name cables that are not purchased from highly counterfeit sources in overseas locations.