FIRST INSTALLMENT :
High Definition usually refers to 720 horizontal lines of video format resolution or more, but there are a lot of subtle nuances to master before evangelizing the world of “streaming HD Quality” video to the desktop.
I thought I understood the standards and had the answers, so I turned to my good friend WIKIPEDIA for confirmation and all I found was more confusion – click screenshot thumbnail to enlarge, and see how confused the wiki of the world is when it comes to HD!!