As long as there have been websites on the internet, there have been people surprised that they can't just put up a website and immediately have visitors flock to their URL.
Building a website is just a first step. Now, you must appease the search engine gods so that your super awesome site can be on page one of the SERPs (Search Engine Results Page) when users are looking for your product or service.
So how does one go about getting such data?
Google Analytics, of course.