Sometimes this is referred to as the Semantic Web. "Semantic" refers to meaning. Most of the Web’s content today is designed for humans to read and for computers to display, not for computer programs to analyze and manipulate. Search engines can discover when a particular them or keyboard appears in a Web document, but they do not really understand its meaning or how it relates to other information on the web. You can check this out on Google by entering two searches. First, enter “Hilton in Paris”. Because Google does not understand ordinary English, it has no idea that you are interested in the Hilton Hotel in Paris in the second search. Because it cannot understand the meaning of pages it has indexed, Google’s search engine returns the most popular pages for those queries where ‘Hilton’ and ‘Paris’ appear on the pages.