I'm learning english and advertisement
AdWords Quality Score base on measuring the relevance and quality of ads in AdWords. It is determined primarily based on clickthrough rate (CTR percentage ratio of clicks to impressions) of the keyword and the relationship and relevance of the other factors.
There are several different AdWords Quality Score, whose relationship consists of the main Quality Score. The most important are:
Quality Score at the site level,
Quality Score for the keyword level.
Quality Score on the level of advertising text,
Quality Score landing page.