20 Jul How Search Engine Works?
Search engines have two major functions: crawling and building an index, and providing search users with a ranked list of the websites they’ve determined are the most relevant.
1. Searching the web:
The world wide web is a big place. If you know the web address, or URL, of a site you can find it by typing it into the address bar along the top of your browser. But what if you don’t know the URL?
You can find pages by following links from other pages but usually it is easier to search for things using a search engine.These are programs that search an index of the world wide web for keywords and display the results in order.
2.Crawling And Indexing:
Links allow the search engines’ automated robots, called “crawlers” or “spiders,” to reach the many billions of interconnected documents on the web.Once the engines find these pages, they decipher the code from them and store selected pieces in massive databases, to be recalled later when needed for a search query. To accomplish the monumental task of holding billions of pages that can be accessed in a fraction of a second, the search engine companies have constructed datacenters all over the world.
3. Finding things online:
When you want to find the answer to a question, such as, ‘Best Institute of Digital Marketing delhi’ You need to think about the important keywords.You could just type the whole sentence into the search engine but it will probably ignore some words, like joining words and punctuation. Instead it might save time to search for keywords like ‘Digital Marketing’, ‘Institutes’ and ‘Delhi’.
4. Providing Answer:
Search engines are answer machines. When a person performs an online search, the search engine scours its corpus of billions of documents and does two things: first, it returns only those results that are relevant or useful to the searcher’s query; second, it ranks those results according to the popularity of the websites serving the information. It is both relevance and popularity that the process of SEO is meant to influence.
5. Ranking & Retrieval:
The last step is what you see – you type in a search query, and the search engine attempts to display the most relevant documents it finds that match your query. This is the most complicated step, but also the most relevant to you or I, as web developers and users. It is also the area in which search engines differentiate themselves (though, there was some evidence that Bing was actually copying some Google results). Some work with keywords, some allow you to ask a question, and some include advanced features like keyword proximity or filtering by age of content