What does this mean HDTV and help me choose HDTV.

So my tv broke and I want a new one so tell me what does this mean http://microcenter.com/product/357567/42_Class_720p_Plasma_HDTV
It says it display 720P but supports 1080P, its resolution is 1024×768 so how does it support 1080P?
My next question is which tv is better. This one
http://www.bestbuy.com/site/LG---42%26%2334%3B-Class---LED---1080p---60Hz---3D---HDTV/6728901.p?id=1218786215984&skuId=6728901
or
http://microcenter.com/product/357567/42_Class_720p_Plasma_HDTV
I know the refresh rate is higher and has something to do with picture and the higher the better but which one is better?
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~iKickback
Answer #1
the one at best buy is better, HDTV just means high definition television
Answer #2
the one at best buy is better, HDTV just means high definition television But I like the Plasma there is less black bars in the tv. But whats the difference between 1080P and 720P and how can a 720P tv support a 1080P video or this tv http://microcenter.com/product/404083/42LM3700_42_Cinema_Class_1080p_LED_3D_TV_-_Sound_Bar
Answer #3
For 720p the number of pixels that make up the image is about 1 million (equivalent to 1 megapixel in a digital still camera) and about 2 million pixels for 1080p. This means that a 1080p image has the potential to display a lot more detail than a 720p image.
go for the best buy one