What is a DVD drive?

I bought a Thermaltake Versa H17 Black SPCC Micro ATX Mini Tower Gaming Computer Case, but did not notice it didn't have a front BDDVD opening

Blu-ray DVD Drives Compare Aerocool CS103 M-ATX Case - Black · Aerocool CS103 Micro-ATX Case, Black, 1x 80mm Fan, 4x Expansion Slots, LN103146

computer case with dvd slot RGB-packed bling box? Aquarium-style glassy chassis? The right PC case makes or breaks your PC build Here's what to look for in a new tower chassis,

computer slot games These expansion bays are located at the front of the case so that, for example, the DVD drive can be easily reached by the user when in use At