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Query: A keyword or a keyword phrase or an inquiry gets entered and saved into a search engine or database and when a person or user types in words and then search engine database results that totally matched results to the user’s query.

 
Quality Content: Quality content refers to Content which is link worthy and valuable in nature.

 
Quality Score: A number allocated through Google to paid ads in a mixture auction that, jointly with maximum CPC, established each ad’s rank and SERP position. Quality Scores reflect an ad’s historical CTR, keyword relevance, landing page relevance, and other factors proprietary to Google. Yahoo! Indicate to the Quality Score as a Quality Index. And both Google and Yahoo! display 3- or 5-step indicators of quality appraisals for entity advertisers.