Technology has replaced a lot of the ways we do things. Icons are a common representation of things in the real world, which no longer apply to modern technology, yet we don't yet have better ideas for what they represent, so we've kept them.
- A floppy disk icon for saving something - most prevalent in Office applications
- A symbol of a telephone for the dialler app on mobiles
- Encyclopedias - Wikipedia is now a digital encyclopedia rather than tens of volumes