Core Update is launched to improve the relevance of search results. This broad core update does not target specific pages or sites, however aims at making the search more useful and helpful. 

Read more on it this post. 

Google concluded their November Local Search Update on December 8, 2020. According to this update, local updates are based on three factors: relevance, distance and prominence. 

In simple words, this update helps local businesses that are close to the user rank better than those that are far away. 

Read more about this here. 

A tweet by Google Search Liaison suggests that Google has recently released a spam update as part of regular algorithm updates. 

Site owners are asked to follow the Webmaster Guidelines.