What is the Algorithm Update, What is the best source to know updates? Google makes changes to the search algorithm to improve the quality of results. Sometimes Google implements some minor tweaks and sometimes some major updates like Penguin, Panda, Humming Bird and Payday loan update etc. The best source to see all updates ordered by date:  Moz Algorithm Updates What is Mobile Friendly Update and when was it launched? Mobile Friendly update was released on 21st April 2015. The major target of the update was to make the websites mobile friendly. The site which didn’t follow the guidelines of Mobile SEO were affected with the update. How many times does Google release the algorithms and updates visible to users? According to industry sources, Google updates their search algorithm 500 – 600 times yearly. These updates are classified as minor updates and major updates. Most of the time we get information about the major updates, which has a very significant impact on SERP