What is a Google core update
Core updates occur multiple times throughout the year, with the bigger updates happening every quarter. A Google core update is the process in which the algorithm Google produces adjusts, with an intended outcome to increase the relevancy of search results to the user. The algorithms affect the search rankings, and each core update is often described as being 'strong' or 'weak', often comparing to the previous core update.
We previously wrote an article on the BERT update, this was a prime example of a strong update which Google announced as being the 'biggest change to Google search in the past 5 years'. That being said, this new January 2020 Core Update is showing to be more noticeable and widespread.