Some of my coworkers were talking about using RSS to read blogs, which made some of the younger folks in our team ask what it is and why we keep using it.
Some still use iPods to avoid subscriptions and streaming services, my favorite was one of our sysadmins who showed me Gopher.
I’m curious about others though, thanks!
You need to specify whether you’re taking about digital or analog technology, or some other limit on the question, because i think you’re not looking for answers like “fire” or as another user replied “shoes”.