Google Query Processor Works

The Google query processor has several parts, including the user interface (search box), the "Google Search Engine" that evaluates queries and matches them to relevant documents, and the results formatter.

Google considers over a hundred factors in computing a Page Rank and determining which documents are most relevant to a query, including the popularity of the page, the position and size of the Google search terms within the page, and the proximity of the Google search terms to one another on the page. Google also applies machine-learning techniques to improve its performance automatically by learning relationships and associations within the stored data. Google closely guards the formulas it uses to calculate relevance; they're tweaked to improve quality and performance, and to outwit the latest devious techniques used by spammers.