A DVD drive is multimedia. Computers often have this installed in them already, but it’s also possible to add one later. A DVD drive serves as a device that can read and write DVDs. It does this to fulfill the complementary technology requirement of the CD ROM; that is, audio and visuals (usually). Of course, there are other devices for audio and visuals like CDs or computer files like videos or images, but machines commonly need a way to burn their data on discs in order to use these media types outside of computers themselves. This is why we need a DVD writer; we want things like movies or music in our homes and cars and not waiting for us on our Netflix queue back home.