Measures of Dispersion and Variability: Range, QD, AD and SD
How search engine works
1. 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.
2. 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
Major Platform of Search Engine