every time we do search on google we get so many pages related to the keyword, each page is in blue color and is connected with its direct link (which is in green color), but the thing is that sometimes I find some web pages extended by another gray website!. Another thing is that some other pages get stars under their direct link!
so I wondered on what base that google work on to show these pages this way; I mean why these pages are different like this (some have only green direct link, others have extended by gray website, and another have stars ranking and reviews)
what does this really mean?
thank you very much