Nowadays, an optical disk drive is not necessarily needed as you can install an operating system using a USB stick.
Nowadays, many people are downloading or streaming digital content from iTunes, Spotify, Netflix, Hulu or by other means from the Internet.
If this is the case for you, perhaps you do not require a DVD or Blu-ray drive.
However, if you have a large DVD or Blu-ray disc collection, you will need either an internal or external disc drive.
An internal drive integrates better with your case, but disc drives can have compatibility issues with aftermarket CPU coolers, so be sure to check that.
An external drive might be a better choice if you need the disc drive only rarely.
Last but not least, many optical disk drives have a lot of text in the front panel, so choose the one that has the most stylish front panel.