1. Google algorithm is the program used by Google for ranking websites on it’s result pages among organic results. The first page is more relevant for the query 2. Page-Rank Algorithm is the heart of Google’s searching Developed by Larry Page and Sergey Brin Based on the hyperlinks map An excellent way to prioritize the results of web keyword searches 3. Google Panda was launched in February 2011 Its main target was to detect “content farms” and to block them from showing in Google search results 4. Google Penguin was launched in April 2012 fighting against spam sites and erasing them Basically it’s a place where all your hard work is stored 5. Humming Bird Algorithm Launched in September 26,2013. The name originates from being “precise and fast”, just like hummingbirds are. Its made a biggest changes in Google history It sorts through all the information it has when you search and come back with answers This algorithm does not affect SEO. It takes into account question based queries like “why”, “who”, “when", "what” etc. 6. The Knowledge Graph is a knowledge based search to enhance its search engine’s where information gathered from a wide variety of sources 7. Limitation of Humming Bird The knowledge graph still does not incorporate many languages. The Algorithm result is not applicable to all countries.