Web 3.0 is a concept focused on the development of Internet technologies, formulated by the head Jason Calacanis (Eng. Jason Calacanis) in continuation of the Web 2.0 concept of Tim O'Reilly. Its essence is that Web 2.0 (which in turn is a reinterpretation of Web 1.0) implies ensuring the understanding of information on the Web primarily by a person, and Web 3.0 will provide interaction and understanding of data on the Web by computer systems.

The definition was published on Kalakanis' personal blog[1] on March 10, 2007. Kalakanis noted that Web 2.0 made it possible to use a significant number of powerful Internet services with high consumer qualities quickly and practically for free, which led to the emergence of a huge number of monotonous resources, and, as a result, the depreciation of most of them. The idea is that a new platform should arise based on Web 2.0 — not so much technological as socio-cultural, used by professionals to create interesting, useful and high-quality content. As an example of the trend towards the transition from Web 2.0 to Web 3.0, Kalakanis cites the German Wikipedia section, which, as it is filled with content, resorts to closing high-quality articles for editing by inexperienced participants, introduces peer review of articles by professional editors[2].

One of the interpretations of the term Web 3.0 is its correlation with the semantic web. The main idea of this concept is based on the introduction of a metalanguage describing the content of sites for organizing automatic exchange between servers. Descriptive mechanisms of the semantic web have indeed been developed (RDF, DAML, OIL, OWL), however, a number of problems appear at the stage of processing and output of information:

the need for additional costs to create a semantic version of each site, which makes the technology much less accessible; the lack of a guarantee of an adequate description by webmasters of their own resources (similar to the history of using the "keywords" tag); the inability to adopt a single format for describing the properties of resources in the conditions of existing competition due to the corporate advertising policy of the creators of the resource and the availability of a wide field for manipulating descriptive mechanisms. The author of the concept of "Web 2.0" Tim O'Reilly proposed to define Web 3.0 as "the interaction of the Internet with the physical world." He has also repeatedly criticized[3] the identification of the semantic web and the concept of Web 3.0.