Some of the largest and most popular Web search engines are constructed when the Web search engine sends out a command to search all Web sites and make copies of the individual Web pages. The copied Web pages are sent back to the Web search engine which uses another computer program to organize the copied Web pages. Counting the number of times a word is used on a Web page Attempting to determine the context in which words are used Ranking words in order of perceived importance Because Web search engines rely on computer programs to do the indexing, search engines have unique limitations. An essential factor in good indexing involves the indexer's ability to think and to interpret meaning. Because computers cannot think they are not able to make decisions concerning what a Web site is about.
Interpretation is a very complex process and is well beyond the abilities of a computer.
As a result of this inherent limitation on the part of computers, Web search engines often provide meaningless responses to a searcher's inquiry.