So I need a dvd player and and a blue ray player?
Most blue rays will play DVDs as well.
Blu-ray is to DVD what DVD was to CD. The disks all look alike, but a DVD disk can hold a hell of a lot more data than a CD, and a Blu-Ray disk can hold a hell of a lot more data than a DVD. Blu-Ray players/burners can also handle CDs and DVDs.