Definitely CDs and Floppy disks. When I was a little kid I've used some floppy disks, but they were already in the phase of being replaced by CDs since they could store a lot more data and I've used CDs a lot, especially for games and music.
Right now, I just use them as a backup method if, say, for some reason I can't boot off of a flash drive.
Are CDs really becoming obsolete? I mean, I know Best Buy recently announced their plans to get rid of their CD sales in-store, but for certain these things are nowhere near dead that people think they are.
When your laptop from 2014 is working just as fine in 2018 and it has an optical drive, then no. :phave you really not noticed that most modern laptops dont have optical drives anymore?