Buying DVD or Blu-ray player? What's the big difference?
Blu-ray can play movies in HD (high definition1080p), which is much better than DVD (576i), of course some DVD player can upscale to 1080i.
Blu-ray provides for multiple streams of audio, so it can produce superior sound on a wider variety of high-quality home theatre systems, though most home users will be happy with the standard Dolby 5.1 surround sound that's already available on most DVD titles.
You can play DVDs and CDs in a Blu-ray player, but you can't play a Blu-ray disc in a DVD player.
Blu-ray disc capacity is up to 10 times higher than a DVD, which means you can fit a lot more video on each disc, even at higher quality, including interactive games and other content.