The fourth industrial revolution is the implementation of Artificial Intelligence and Robots in the work place and in the home environment.

@3 Thank you Steve, that is very helpful. I keep on hearing the term used in recent months but did not quite know what it meant, your input has helped my understanding. I notice on this platform a new book has gone up in the digital section named "Understanding the Fourth Industrial Revolution". I think I'm going to invest in a copy to get an even deeper understanding of what it is.

Steve, I think the Fourth Industrial Revolution is more than just AI and Robotics, I think there is a confluence of disruptive technologies all happening at the same time. For examples:
Blockchain and Crypto Currency
Adaptive technologies (e.g. 3D Printing)
Nano Tech
Advanced Materials
The Internet of Things
Biotechnologies
Quantum Computing
Renewable Energies