Or a tape cassette, or a video, or camera film and good old fashioned photo developing.
We've just cleared out our loft and thrown all records/tapes and videos as we realised we no longer have the means to play any of these things! Its unreal to think when my 3 year old is older i will have to explain these old fashioned things to her.
What else is there that they won't know of? Life before computers and the internet?