Overview[ edit ] People use tags to aid classification , mark ownership, note boundaries , and indicate online identity. Tags may take the form of words, images, or other identifying marks. An analogous example of tags in the physical world is museum object tagging. People were using textual keywords to classify information and objects long before computers.
Meta Tags Concept-based Searching This information is dated, but might have historical interest for researchers Search engines use automated software programs knows as spiders or bots to survey the Web and build their databases. Web documents are retrieved by these programs and analyzed. Data collected from each web page are then added to the search engine index. When you enter a query at a search engine site, your input is checked against the search engine's index of all the web pages it has analyzed. The best urls are then returned to you as hits, ranked in order with the best results at the top. Keyword Searching This is the most common form of text search on the Web. Most search engines do their text query and retrieval using keywords.