No and HD DVDs have been permanently discontinued
Yes, BluRay DVD players also play non Blu-Ray DVDs with no problem.
Yes, dvds can be played on bluray players.
Yes. Some Blu-Ray players can even play photo CDs and some can even display data on SD cardsAll players can, but not the very early ones (the first ones were manufactured in 2006)All Blu-Ray players can play DVDs and CDs
DVD players cannot play Bluray discs. The lasers and the data storage are different so no data can be read from a Bluray disc in a DVD drive. That is the case whether or not there is any up-scaling available in the player. Bluray players on the other hand are quite happy to play DVDs as well as Bluray discs.
A DVD player cannot play a BluRay disc. A BluRay player can play both BluRay discs and DVDs.
DVD players and drives cannot handle Bluray discs, whether recording to them or reading from them. Bluray players and drives on the other hand can use DVD discs as well as Bluray discs.
No. All current 3D disc content is HD and so use Bluray discs. You have to have a 3D Bluray player.
The laser that is in most DVD players can also read CDs, which is why most DVD players can play audio CDs. The laser in straight CD players cannot read DVDs.
No and HD DVDs are discontinued
If it works on a DVD player, it works on a xbox 360
HD DVD and Bluray are both high definition disc formats but they were not only competitive formats but incompatible formats as well. While the battle for the HD market was in progress a handful of players were sold that would support both formats. These players were expensive and very few were ever sold. Unfortunately, HD DVD only players will not play Bluray and Bluray players will not play HD DVD discs. It is still worth keeping HD DVD players as they are the only players capable of HD DVD discs.
To play a high definition DVD, you need a high definition DVD player. There are two types available currently. HD DVD, developed by Toshiba is one and BluRay, developed by Sony is the other. They are not compatible, so an HD DVD will not play on a BluRay player and a BluRay disc will not play on an HD DVD player. BluRay looks like it is the winner in the format war between the two companies over the last years so it is likely that Toshiba's format will disappear in the coming months. Note that HD DVD can refer to the Toshiba format but it can also refer to high definition DVDs in general.