Google tells all in an infographic entitled “How Search Works” how they search and present the most relevant information on topics you are interested in.
First Google has crawled and indexed at least 30 trillion individual pages on the web.
They do this on a regular basis as this number of pages is constantly growing. You can choose whether you want Google to index your pages. The index is where they keep track of it all. (Which is over 100 million gigabytes.) These pages are sorted by their content and other factors.
According to Larry Page, Co-founder & CEO, “The perfect search engine would understand exactly what you mean and give you back exactly what you want.”
In order to deliver the best results possible Google has created Algorithms which are programs and formulas they use to search.
As you search these algorithms look for clues to get a clear idea of what you are looking for and in turn present you with the best possible documents from their index.
Google has set up a process in which they rank all these results in order to place the most relevant results at the front of the list.
The results can vary from a small to an enormous amount of documents the factors they use to rank these documents are:
Site and Page Quality
Because Google has already reviewed and indexed the pages on the web, they are able to complete this evaluation and suggest a number of results in less than a second. These results can also be sorted into a variety of forms such as:
Web Pages, Images, Maps, Shopping, News, Videos, Books, Places
The list goes on…..
You can further sort the list by time, exact terms, related searches, and location.
Google does its best to fight spam such as;
Unnatural Links, Pure Spam, Hidden Text and Keyword Stuffing, User Generated Spam, Parked Domains, Thin Content with Little or no Value, Unnatural Links to a Site, Cloaking and/ or Sneaky Redirect Links, as well as Hacked Sites.
Most of this spam is eliminated automatically however if there is a questionable document they will remove it from appearing in results manually.
The results of the search should “in theory” provide the searcher, by listing documents on Page One that are most relevant to their inquiry and a varied number following, that may be what you are searching for. Or it may help narrow down your search to help you get to the information you are looking for with additional searches.
And according to Google, That is How Search Works.