So, the first generation of technology is the simplest solution for conducting digital transactions, which are checked by a decentralized network. This is the only function that the first generation can perform. For example Bitcoin, Litecoin, Ripple.
The second generation of blockchain allow the use of smart contracts, programming tokens, and launching applications. For example, Ethereum, Neo, Xem.
Now it's time for the third generation. At the moment, many new blockchains are being developed. The third generation must carry a new, revolutionary idea. It must have a cardinal difference from the former.
What is the fourth, fifth generation and so on I do not know. But I think it's just marketing
What do you think about it?
I want to draw your attention to UseChain project. It will allow introducing innovative ideas for new blockchains 3.0. The team has been working since 2016. It looks very interesting and promising. I think that this theme is very relevant in our time.. http://www.usechain.net/