Google optimization is the brain behind search engine optimization. The purpose is to provide answers for web searches. These searches come from anyone who accesses to surf the internet.
Search engines has backend search algorithms. Website owners can check how many has visited the site. It also shows how high or how low it ranks among websites. The goal is to position at least on the first page, if not right at the top.
Sophisticated websites with good content and specialized link buildups are better. It has more chances of making it on the top rank. It then becomes the easiest site to visit.