What's the difference between Blu-ray and DVD?

Compared to DVD, Blu-ray discs offer HD video playback, and allow over 5 times the data capacity. Blu-ray discs use a blue violet laser to read and write discs, while DVDs use a red laser. The shorter wavelength of a blue-violet laser and improved lens specification are main factors which enable more data to be written in the same amount of space versus a red laser.  more

It is definately worth it, as long as you have a High Definition TV. Normal DVD's can display in 480i or 480p which are standard definition resolutions. However Blu-Ray can display resolutions up to 1080p. The Blu-Ray also has much more storage capacity than a normal DVD. Blu-Ray format aslo supports advanced audio processing methods such as DOLBY True HD as well as DTS HD. All in all if you have a High Definition TV, you will definately notice the difference. I would recomend rented them from blockbuster for 99 cents a night instead of shelling out $20+ for the Blu-Ray discs. Keep in mind you will need a Blu-Ray player to play them, as they can not be played on a conventional DVD player. If you are in the market to buy a Blu-Ray player I would recomend buying a Playstation 3 as I believe that is still one of the best Blu-Ray players on the market.  more

Blu-ray allows films to be stored in high definition (1080p) at higher bitrates and allows supports higher quality 7.1 sound tracks.  more