High Definition Blu Ray Cable Connection
Your high-definition TV may have either an HDMI connection or a DVI input. Either connection can get you 1080p resolution -- the only significant difference is that, if you use an HDMI input, you won't need to use a separate cable for the audio signal. You can expect your Blu-ray player to have an HDMI connection on it, so make sure to get either an HDMI-to-HDMI or HDMI-to-DVI cable, depending on which connector your high-definition TV has.
Other Television Connections
For non high-definition televisions you still want the best possible cable connection to get the best picture quality. Check you television to find the highest connection type it will support
Blu-ray Player Connection/Cable Options and Types
1. HDMI or DVI: These are the only connection types that will get you 1080p resolution, which will give you the best possibly picture quality from Blu-ray. Unlike a DVI cable, an HDMI cable will also carry the audio signal, making HDMI the simplest way to connect your Blu-ray player to your receiver or HDTV. Generally speaking, you wouldn't use a DVI connection unless HDMI wasn't an option.
2. Component: Also sometimes called Y/Pb/Pr, this is typically your best option for non-high-definition TVs. You can sometimes use this connection with high-definition TVs (such as if your high-definition TV doesn't have a HDMI or DVI input) to get 1080i or other lower-resolution video signals. With a non-high-definition TV, this will get you 480p resolution (which is what you got from a DVD player with progressive scan, when you used it with component cables).
3. S-Video or other connections: If HDMI, DVI and Component are not available with your television then S-Video is your next best choice, followed by the basic 'Video Out' connection. These cables will generally just get you 480i resolution (standard-definition TV quality).
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