High definition refers to the quality of the picture, and plasma refers to the type of screen. All plasmas will be high definition, but not all high definition TVs will be plasma.
Yes the plasma t.v has high definition if you don't have cable. when you buy it, the t.v has it included
Plasma display panel, high definition, television.
hdmi or component cables
To watch a Bluray disc in high definition, an HDMI cable is needed. However, almost all Bluray players have an analog, standard definition output that can be connected to televisions that do not have HDMI inputs.
A Plasma TV is just one type of technology used in High Definition TVs, which are TVs that operate at certain resolutions (720p and 1080i most typically). A plasma TV can be high def it is how fine of a picture the TV can show.
YES
You can watch Standard Definition television on a plasma TV as well as HD. You can really watch any definition on any new TV they have the capability for both. Plasma's supposedly make the picture more clear than does an LCD or an LED though. http://www.avsforum.com/avs-vb/showthread.php?t=826493
Standard Positioning Service high definition television
You can connect your standard definition TV to your satellite receiver in a couple of ways. First, if your TV has composite video/audio inputs (yellow, red, and white RCA jacks), you can connect to these inputs using the composite video outputs of the satellite receiver. Another alternative is to use the standard coaxial cable output from your satellite receiver to connect to the 75ohm antenna input on your TV. *Note: Neither of these connections will display high definition programming on your standard definition TV. The TV is only capable of standard definition, so you will see a clear picture, but it won't be true high definition, regardless of the input signal's definition.
DirectTV is a satellite broadcast platform delivering both standard and high definition television. As all high definition televisions will handle both SD and HD content, DirecTV is fully compatible.
only with a converter box, but then it becomes just standard definition