What is SEO Today?

So, we know the history of SEO. Now we try to understand adapt to search engine algorithms and how marketing strategies have changed. Now a days Google is the big boss in search engine world. Google wants to reward companies who focus less on gaming algorithms and more on creating value for their leads and customers.
So Mr. Google create a robot for giving better service and find out the real content. After that other search engine also create robot, like yahoo, bing. So if we try to understand SEO then we must try to understand Mr. robot. Hmm Mr. Robot the cleaver one.