If you wanted to get an idea of how famous a website is, finding out the website's "Internet Alexa" is one of the most well-known ways to check for that.
Owned by Amazon.com, Alexa is a web analytics company that provides web traffic statistics and other marketing metrics based on the information it gathers from different toolbars and web browser plugins from around the Web
Though Alexa runs a number of services and has even been involved in some notable projects in the past (such as providing a database that served as the basis for creating the Wayback Machine), its most noted service or resource is "Alexa Rank.”