With the standard search engine used on most websites, a word or phrase, which is to say, a string of symbols, is entered into the search window. The search engine analyses it and presents the subpages containing our search term. The problem with appropriate and relevant searches springs from the fact that the person doing the searching is unfamiliar with the structure of the website. They have no idea if it actually contains the information in question, if the word or phrase they are asking about appears anywhere within it. If we take ‘safety’ as an example of a vehicle-related search term, we can assume that a user entering it would normally be expecting to see information about systems that help drivers to be mindful of safety during a journey. What can happen, though, is that the word ‘safety’ is not used in the subpages containing descriptions of safety systems. This means that the search will not produce relevant results, even though the structure of the website does include subpages that provide information about systems such as anti-lock braking, emergency brake assist, electronic stability control and so on.