Metadata or data about data has been an important topic in software and the web all along. In the old days we used metadata on a HTML page source to increase its searchability. That is by adding metadata or tags to a page we would tell the search engines what the page is about so that if someone searched for one of the tags, they would return the page in their search result. So a page on a given product or service (e.g. camera) could contain a list of relevant terms (e.g. photography). This is still relevant even in HTML 5 with the tag <meta>. (See: http://www.w3schools.com/tags/html5_meta.asp).
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