Web 2 was a set of features on top of web 1, which gave room for the existing features to catch up ever so slightly to flash, activx and java applets. Instead of largely static pages with some interactive content, the entire page itself became interactive, without many of the drawbacks of plugins. Anyone could see the magic the first time they saw gmail or facebook or whatever load content without reloading the entire page.
Web3 brings features that are only surfaced to users indirectly... just implementation details, really.
Web3 brings features that are only surfaced to users indirectly... just implementation details, really.