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The internet is fundamentally a large storage unit for immense amounts of data. Consequently, the majority of online users log on to the internet in order to find information. Innovations in technology continue to make both the production and consumption of this information an easily achieved endeavor, resulting in high expectations for instantaneous answers via immediate search results. While a plethora of information is not difficult to find, knowing what to do with that information is often problematic. To turn information into knowledge requires an ability to contextualize it and critically engage with it. WebMD is a highly recognizable health information database that often runs into information overload problems with its users. This thesis will examine the information that the WebMD website provides, as well as its usability. The goal is to investigate, firstly, the importance of context for knowledge-forming when users perform online information research and, secondly, the critical literacy required to use such information.

The thesis is engaged in business and marketing information databases about economic subjects registered in the Czech Republic which are available on the Czech market. It monitors the rise and development of databases in general, deals with the databases of businesses and provides an overview of the most important providers of information about companies and their information products. Analyzes two selected databases of companies and describes the practical examples of their usage from marketing manager's point of view.