What is web 2.0?

Question

Web development

Hello guys!
I came across the book "Development of Modern Web Sites HTML 5, CSS3, WEB 2.0" Author Dronov V.A.
Actually there was a question.
In a nutshell, please tell us what web 2.0 is, and in connection with the fact that web 3.0 has come out, send a link to study it, preferably a book.
Thank you all for your answers friends, health and prosperity to you and your families :)

Answer 1

For starters, I suggest reading the books "wikipedia for dummies" and "how to use google"
https://ru.wikipedia.org/wiki/Web_2.0
magical site that knows the answers