Internet 3.0: knowledge inheritance, establishing a "Web library" based on all Web resources, and realizing human's own "knowledge inheritance".

Internet 4.0: knowledge distribution.

2. Different roles:

Internet 3.0: Connecting knowledge consists of ontology, semantic query, artificial intelligence, intelligent agent, knowledge node and semantic knowledge management.

Internet 4.0: The key to connecting information is that it can provide you with anything you need anytime and anywhere.

3. Different characteristics;

Internet 3.0: effective aggregation; Universality; New digital technology; Vertical website.

Internet 4.0: the next generation Internet characterized by * * * biological web, massive web, synchronous Web and intelligent Web.

China Academy of Social Sciences-web4.0

Baidu encyclopedia-web3.0