I do not know if I was clear before.
Any "newer technology" players (or hardware) will play older tech software (discs), but the reverse is not so. CDs came first, so those players can only play CDs.
DVDs came next, but they can play both CDs and DVDs, but not Blu-ray.
Later came Blu-ray and those players can play any of the previous formats, same with the 4K UHD players (most current high definition format, mostly for movies at this time) can play any discs.
3D is a different world, though. Those specific 3D discs have to be played on a 3D player and watched on a 3D TV, using 3D glasses specific to the brand of TV you are watching, BUT most 4K players can play them in 3D. You still need the glasses for your specific TV, though.
Not a big 3D fan, me. I tend to get a headache after about three minutes of watching.
4K is similar. You would need a 4K player, a 4K disc and a 4K TV to watch in 4K. Kind of an expensive proposition to get started.
Hope that is not too much of a