The language of silicon dreams and stack overflows.
Gossamer-thin strands of glass or plastic that transmit data using light—because electrons apparently weren't cool enough and we needed to make physics weird by asking light to do the internet's job.
A microscopic 'X marks the spot' etched onto circuit boards that screams at pick-and-place robots exactly where to snag and deposit components—because manufacturers discovered long ago that 'approximately somewhere in the vicinity' leads to crying CEOs and burning money.