Web 3.0 is a network of meanings, a network of knowledge, to which semantic technologies such as Semantic Web add an additional layer, thus extending it and making it possible to bring to light the information of most interest to the user.

Unlike in the previous stages of Internet development, the Web is becoming proactive, it adapts its characteristics to the given user’s individual needs, knows the user’s habits, knows how to react in accordance with the circumstances at a given moment. Out of the entire information stream reaching the user, only the data is selected which is of direct relevance to the user and valid at a given moment, place and time. Semantic technologies describe meaning in a manner completely isolated from their physical representation and from the code of the applications they are used by. Thus it does not matter if it is Chinese, visual, HTML or a programming language that is being used to record information.

It is becoming more and more obvious that the ubiquity of different data regarding different people, their accumulation on different devices in different places is so complicated that it is virtually impossible to transfer them between those devices.

For all of the above reasons, technologies such as the Semantic Web, which enable connection and inference based on distributed data sources, will form a basis for the development of applications, services and information technology systems of the future. By analogy to the WWW, when it appeared, no one, including its developer, Sir Tim Berners-Lee, imagined that services such as eBay, Amazon, YouTube or Google would ever exist.
At the moment, we are given a similar chance. New possibilities are opening up which cannot even be identified at the moment. What is very interesting though is the fact that the possibilities that can be anticipated already now carry such enormous value with them.