Seo-promotion and sponsor links

There are always new discoveries. When you use Baidu for search, a "promotion" link will appear, and a "sponsor" link will appear. it seems inexplicable. so I asked. what is a promotion link and a sponsor link. I used Google and Baidu to ask. A lot of fuzzy concepts are obtained. A definition is provided for the moment to facilitate self-identification. if the visitor has a clear answer, please let me know. (PS: it does not require accurate academic definitions, but it is practical to find words that can reach the goal .)

Promotion link: The Search Keyword exactly matches the purchased keyword.

Sponsor link: The search keyword matches the purchased keyword and has the related keyword concept.

It seems that this matching can be controlled by the purchaser, because the cost of clicking through the promotion link or sponsor link is the same.

Declare that I have never purchased and have no practical experience. I just want to analyze and learn ing.

Reference link:

Http://zhidao.baidu.com/question/17413221.html

Google Tag: Seo learning, promotion links, sponsor links