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yushire said:
Do u mean its the same as adjusting your resolution on your computer monitor? Like 640x480 720x1280 and so on to adjust it with your huge pc monitor? So what do you see in your TV if its done in High Defintion? What improvement does it make and what that got to do with graphics?



1080 means it's a resolution of 1920x1080

720 means it's a resolution of 1280x720

What it has to do with graphics is that more detail and such can be seen. When it comes to television and movies, try watching something like golf (for example) on an SDTV and then try watching it on an HDTV and you'll be able to see much more detail, color, and everything will look much nicer. A quick google search found this image below. 

http://www.erenumerique.fr/images/60/20060710/btv_hd_sd_comparison_big.jpg

My room mate was playing a basketball game on his 360 on our HDTV (720p/1080i), but only with composite cables (480i) and I asked him if he wanted to use my HD component cables to make use of the TV. The second we hooked his 360 up with composite cables, he was shocked. He said things like "Wow! Is that sweat on the guys! Everything looks so much clearer now!".