Most computers no longer have optical disc drives built in. This reflects our reliance on high-speed Internet to deliver software and entertainment. That said, optical disc drives can still be handy. You will need an optical disc drive if you want to play CDs, DVDs, or Blu-rays. Furthermore, you can digitize your discs. Ripping DVDs is incredibly easy and won't cost you a cent.
Additionally, you can copy your music CD collection in lossless format, which is significantly better than most audio streaming services. Don't forget about your Blu-rays. You can copy those, too, provided you opt for an external optical disc drive that's compatible with the Blu-ray format.