What would you like to do?
In general, yes. All BD players I know of will play regular DVD's.
No, you need a BlueRay player, or an XBox 360 - it has one built in.
Yes you can play regular DVD's on a blu ray
Yes, but Blu-Rays will not work on DVD players
no you need a blue ray player or play station 3 with has the blue ray laser in
No. Blu-Rays are NOT DVDs and will only work on Blu-Ray players and HDTVs
No. Blu-Rays will only work on Blu-Ray players and Blu-Ray players only work on HDTVs
Most Blu-Ray players can play "regular" DVDs
no, ive tried it and the DVD player just says no disc
Yes. It also acts to upconvert the image to near 1080p resolution (subject to the max resolution of your television)