Google releases updates to its search algorithms regularly, and these updates can have a significant impact on search results. Some updates are minor and may not be noticeable, while others can significantly change the way search results are ranked. Some of the more notable updates include:

• Panda: This update, released in 2011, was designed to reduce the ranking of low-quality sites and improve the ranking of high-quality sites.
• Penguin: This update, released in 2012, was designed to reduce the ranking of sites that were found to be spamming or manipulating the search results.
• Hummingbird: This update, released in 2013, was a major overhaul of the search algorithm that was designed to improve the way that Google understood search queries and returned results.
• Pigeon: This update, released in 2014, was designed to improve the ranking of local results and provide more relevant results for local searches.
• Mobilegeddon: This update, released in 2015, was designed to improve the ranking of mobile-friendly sites in the search results.
• Fred: This update, released in 2017, was a targeted update that was designed to reduce the ranking of low-quality sites that were found to be violating Google’s guidelines.

It’s important to note that these updates are just a few examples of the many algorithm updates that Google releases on a regular basis. It’s always a good idea to stay up-to-date with the latest updates and changes to the search algorithms to ensure that your site is as visible as possible in the search results.