The ranking of a website means it's position within a result list (of a directory or a search engine). As the position of the same site will differ depending on the item of search there is a general rank expressed by a value which indicates the general importance of a website.
Because of the immense influence of search engines many people use the term ranking only in connection with those. The most well-known and used rank is the "Pagerank" which is used by Google.
"They came to see and to be seen as well"