It was launched in February 2011. Panda update is to target websites with low-quality content and prevent them from ranking well in search engine results pages(SERP)
It was launched in April 2012. Penguin update is to targeting spammy links. Google looks at backlinks as a signal of a website’s authority and reputation, taking a site or page’s backlink profile into consideration when determining rankings.
Is was launched in 2013. Hummingbird update was designed to improve Google’s semantic search capabilities. It was becoming increasingly common for people to use Google in a conversational way, to type their queries as though they were asking a friend. This update was designed to help Google respond by understanding intent and context.
Mobile-friendly update occurred in April 2015. This update was special because Google warned website users in advance that it was coming.
In this update, sites that focused on the user experience and distributing high-quality content were rewarded by Google.
This update was designed to learn and predict user behaviors.