Piece of a content located in the website's footer
Sctuctured data (aka markup) in the code of a webpage
Information of a page in the SERP (Title, Description, URL)
Company description on business web-directories
A page with the company's contact information
A page that should be optimized for a specific keyword(s) and which has to appear in SERP for that particular keyword.
Product pages with their prices
A page that a user lands on when they click on a link from SERP
Malware created by hackers to simulate Google spiders
Google algorithm which determines rankings of the websites in SERP
Spider programm created by Google for scanning the Web and collecting documents from it into the Search index
Usage of LSI keywords
Here's an interesting quiz for you.