Quality Content

Content which is linkworthy in nature.

Quality Link

Search engines count links votes of trust. Quality links count more than low quality links.

Query Refinement

Some searchers may refine their search query if they deemed the results as being irrelevant. Some search engines may aim to promote certain verticals or suggest other search queries if they deem other search queries or vertical databases as being relevant to the goals of the searcher.

Query

The word or words used by the user to search for a particular item in the search engine's search box. It is rather called as search term by search engines.

Quality Score

A number assigned by Google to paid ads in a hybrid auction that, together with maximum CPC, determines 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! refers to the Quality Score as a Quality Index. And both Google and Yahoo! display 3- or 5-step indicators of quality evaluations for individual advertisers.