1st Algorithm:-
1. Panda:- It was invented in February 2011. In this algorithm, The change aimed to lower the rank of "low-quality sites" or "thin sites", in particular, "content farms", and return to higher-quality sites near the top of the search results.
2nd Algorithm:-
2. Penguin:- It was invented in April 2012. In this algorithm, The penguin penalty primarily focuses on identifying poor-quality websites based on backlinks.
3rd Algorithm:-
3. Hummingbird:- It was invented in September 2013. In this algorithm, Hummingbird focuses on understanding the actual meaning behind a search query, rather than the separate terms within it.
4th Algorithm:-
4. Rankbrain:- It was invented in October 2015. This algorithm, Rankbrain is a machine learning (AI) algorithm that Google uses to sort search results. 5th Algorithm:- 5. The Page Experience Update:- It was invented in June 2021, In this algorithm, Page Experience Update is a change made to Google's Search Engine in order to improve the quality, relevance and overall user experience of its search results.