The obviouis answer to your question is that you need a CD player - but that being said, you still have many options:

- portable CD players

- CD players designed to be connected to a sound system

- DVD or Blu-ray players (which are also fully capable of playing CDs)

- the CD/DVD drive built into your computer (which you can use for both listening to the CD, or for copying the music on the CD to your iPod or MP3 player)