When someone do spamming or activities against the google webmaster, then google can penalize that site for a particular period of time or permanentely.

What is a Google "Penalty"?
 

Google Penalty is the Negative impact on a Website's Search Ranking based on
Google's Search Algorithms Updates & Google Manually Updates Reviews.

A Google penalty is the negative impact on a website's search rankings based on updates to Google's search algorithms and/or manual review

A Google penalty is the negative impact on a website's search rankings based on updates to Google's search algorithms and/or manual review. The penalty can be an unfortunate by-product of an algorithm update or an intentional penalization for various black-hat SEO techniques.

Contextual back links are links to external websites that are placed within the main or primary content of a web page. Contextual back links come naturally within content. They are not links that are placed within the navigation, sidebars, widgets, footer or ads

A Google penalty is the negative impact on a website's search rankings based on updates to Google's search algorithms and/or manual review. The penalty can be an unfortunate by-product of an algorithm update or an intentional penalization for various black-hat SEO techniques.

A Google penalty is the negative impact on a website's search rankings based on updates to Google's search algorithms and/or manual review. The penalty can be a by-product of an algorithm update or an intentional penalization for various black-hat SEO techniques.

A Google penalty is the negative impact on a website's search rankings based on updates to Google's search algorithms and/or manual review. The penalty can be an unfortunate by-product of an algorithm update or an intentional penalization for various black-hat SEO techniques.

A Google penalty is the negative impact on a website's search rankings based on updates to Google's search algorithms and/or manual review. The penalty can be a by-product of an algorithm update or an intentional penalization for various black-hat SEO techniques.