How search engine Operate?

Imagine the World Wide Web as a network of stops in a big city subway system.

dear viewers, Each stop is its own unique document "usually a web page, but sometimes a PDF, JPG or other file". The serch engines ned a way to “crawl” the entire city and find all the stop along the way, so they use the best path available – links.

 

1. Crawling and Indexing the FirstCrawling and indexing the billions of documents, page, files, news, videos and media on the world wide web.
2. Providing Ansers the 2nd Providing answers to user queries, most frequntly through lists of relevant pages, through retrieval and rankings.

“The link structure of the web serves to bind all of the pages together.learn more”

Through links, sarch engines’ automated robots, called “crawlers,” or “spiders” can reach the many bilons of interconnected documents.
Once the engines find these pages, they next decipher the code from them and store selec\ted pieces in massive hard drives, to be recalled later when neded for a search query. To accomplish the monuental task of holding billions of pags that can be accessed in a fraction of a second, the search engines have constructed datacnters all over the world.
These monstrous storage facilities hold thousands of machines processing large quantities of information. After all, when a person performs a search at any of the major engines, they demand results instantaneously – even a 1 or 2 second delay can cause dissatisfaction, so the engines work hard to provide answers as fast as possible.

Search engines are answer mchines. When a person looks for something online, it requres the serch engines to scour their corpus of billions of documents and do two things – first, return only those results that are releant or useful to the searcher’s query, and second, rank those results in order of perceived usefulness. It is both “relevance” and “importance” that the process of SEO is meant to influence.
To a search engine, relevance means more than simply finding a page with the right word. In the early days of the web, search engins didn’t go much further than this simplistic step, and their results suffred as a consequence. Thus, through evolution, smart engineers at the engines devised better ways to find valuable results that searchers would appreciate and enjoy. Today, 100s of factors influence relevance, many of which we’ll discuss throughout this guide.

How Do Search Engines Determine Importance?its easy

Dears,Currently, the major engines typially interpret importance as popularity – the more populr a site, page or document, the more valuable the information contained therein must be. This assumption has proven fairly succesful in practice, as the engines have continued to increase users’ satisfaction by using metrics that interpret popularity.
Populrity and relevance aren’t determined manually. Instead, the engines craft careful, mathematical equations – algorithms – to sort the wheat from the chaff and to then rank the wheat in order of tastiness (or however it is that farmers determine wheat’s value).
These algorithms are often comprised of hundreds of components. In the search marketing field, we often refer to them as “ranking factors” SEOmoz craftd a resource specifically on this subject – Search Engine Ranking Factors.