Google Analytics is a free service offered by Google and is where, when activating the service via a Google account, and subscribe to a site receives a code to be inserted into the page and registered, each view, visitation statistics are sent to the system and submitted to the website owner. It was created primarily as an aid webmasters to optimize their sites for marketing campaigns and Google AdSense. It is incorrect to think that this service solves the problems of a website automatically without a webmaster behind, it just shows the information to be corrected.
Search domains to identify domains owners, name server details, host and other relative data of that domain.
Check various SEO stats of domains like Google PageRank and Alexa Rank.
Find all the information related to a domain including registrar details, owner details and nameservers.