Google made a splash in May of 2012 when they announced the Knowledge Graph. The Knowledge Graph is a key component of Semantic Search. Semantic Search aims to get at the real intent of the query, rather than simply matching a page to a search string.
A good analogy is that of a headhunter or free agent recruiter. Have you ever received an email about an “exciting opportunity” for which you were completely unqualified? Did they say your resume suggested you’re a fit? This is a case of blind matching of keywords with no qualitative overlay. Talk about inexact science!
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