can blu-ray players??

Blu-ray technology does not read any other formats by default. Make sure the item you are buying is able to read the formats you are wanting to play. Most brands that sell Blu-ray have it so you can read DVD/CD but it is not true of all so ask or read before you buy.

"While it is not compulsory for manufacturers, the Blu-ray Disc Association recommends that Blu-ray Disc drives should be capable of reading standard DVDs for backward compatibility. For instance, Samsung's first Blu-ray Disc drive can read CDs, regular DVDs, and Blu-ray Discs. All other Blu-ray Disc players released support DVD playback as well, however not all support CD playback. This includes Sony, Panasonic, Philips, LG, Pioneer and PC-based players from Alienware, Sony, and Dell. LG has also produced a player that is capable of playing both Blu-ray and HD DVD formats."

Yes. They play normal cd's and dvd's.