1 thru 4

There have been 3 this far, arguably we are in or approaching a 4th.

1st Industrial Revolution

Steam and water power are used to mechanize production

2nd Industrial Revolution

Electricity and assembly lines enable mass production

3rd Industrial Revolution

IT and computers are used to automate processes

4th Industrial Revolution

Interdependent and interconnected cyber-physical systems enable new levels of production efficiency. Includes things like:

  • IOT
  • Information decentralization
  • Real time data collection and analysis
  • Machine learning & AI

Source

Source

https://www.upkeep.com/learning/industry-3-0-vs-4-0- [ ] fix that link