Surface Web
The web which is visible to us without any login is know as surface web.
Surface web is also know as appreant web or that pages whos data is clearly readable by just one click. SE Bots read these page very easily.
There are also some pages which are linked up with javascript URLs are not very much visible to Search Engines, URLs such as javascript:__doPostBack(’ctl00$exampledomain$action001′,”); – Read in detail these SEO Enemy URLs.