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What is Search Engine

Search engine optimization (SEO) is the practice of increasing the quantity and quality of traffic to your

website through organic search engine results.In search results Google displays links to pages it considers relevant and authoritative. Authority is

mostly measured by analyzing the number and quality of links from other web pages.

In simple terms your web pages have the potential to rank in Google so long as other web pages link to

them.

Search Engine Optimization

• A Search Engine is a software system that is designed to search for information on the World Wide Web.– The World Wide Web (abbreviated as www

or w3, also known as Web) is a big collection of HTML pages on the Internet.– Each HTML page is connected through

hyperlinks and URLs.

What are Search Engines?

How does Search Engine works?

Searching

Cra

wling

Indexing

Processing

page Rank

When a user enters a query into a search engine, the engine examines its index.The search engine’s index then determines the relevant web pages from the database.The search engine return only those results that are relevant or useful to the searcher’s query.

Searching

Searching

Every search engine has tiny automated software programs known as robots, crawlers or spiders.

These crawlers visits the websites, read the site’s meta tags read the site’s actual data and also follows the links that the site connects to.

Meta tag – allows the owner of a page to specify key words and concepts. It also can include a STOP signal to prevent the crawlers from reading them.

The crawler returns all that information back to a central depository, where the data is indexed.

The crawler will periodically return to the sites to check for any information that has changed.

The frequency with which this happens is determined by the administrators of the Search Engine.

Crawling

Crawling

– Where does the crawler starts from?The usual starting points are lists of heavily used

servers and very popular pages.E.g.: News channel sites, Online Newspapers sites, etc.

The crawl process can also begins with a list of web address from past crawls or sites provide by website owners.

– How many spiders does a search engine sends?Google uses four Google bots.Their system could crawl over 100 pages per second,

generating around 600 kilobytes of data each second.

Indexing

Processing

Page Ranking

•The Search Engine does not search through the whole Internet when we type a query.•It searches through the copy of the Internet stored in the Engine’s Database.•The Search Engine’s index is matched against to the query from the browsers.•When a relevancy occurs, the web pages are sent from the Engine’s Database.•Therefore, searched results occurs within half a second

after typing the query.

Some Facts

• Google.com - Launched in 1998 by Larry Page and Sergey Brin, Google is by far the most popular search engine globally.

• Yahoo.com - Started in 1994 by David Filo and Jerry Yang, Yahoo! is the second biggest search engine on the web.

• Bing.com - Launched in 2009 by Microsoft, Bing is their latest web-based search service.

• Ask.com - Ask was founded in 1996 with the idea of allowing users to get answers to questions posed in everyday, natural language, as well as traditional keyword searching.

• DuckDuckGo.com - Founded in September of 2008 by Gabriel Weinberg, DuckDuckGo (DDG) prides itself on respecting user privacy.

Top Search Engines

Google Algorithms

Index

Google Algorithms4 Different Algorithms• Panda• Penguin• Pigeon• Humming Bird

Google AlgorithmGoogle's algorithm does the work for you by searching out Web pages that contain the keywords you used to search, then assigning a rank to each page based several factors, including how many times the keywords appear on the page. Higher ranked pages appear further up in Google's search engine results page (SERP), meaning that the best links relating to your search query are theoretically the first ones Google lists.

From time to time Google algorithm works in order to provide better search results and relevant content for internet users.

Google algorithm prevents cheating on the website.

Panda

Penguin

Pigeon

Humming Bird

Panda Algorithm

This algorithm is used to reduce rankings for low -quality sites sites which are low - value add for users ,copy content from other websites or sites that are just not very useful

At the same time, it will provide better rankings for High quality sites, sites with original content and information

It penalizes a website that has nothing but only pop-ups and ads.

Penguin AlgorithmIt is commonly known that the more links back to your website the better SEARCH ENGINE RANKING you will have. The problem is getting links back to your website is not an easy thing to do. When things are difficult, people cheat. Penguin is designed to penalize those who cheat buy purchasing links from ‘link farms’ or ‘link exchanges’ back to their website.So what is a ‘link farm’ or ‘link exchange’? Websites that are designed to create links back to other websites for a fee in order to achieve a higher SEARCH ENGINE RANKING

Pigeon Algorithm

This algorithm ties deeper into their web search capabilities, including the hundreds of ranking signals they use in web search along with search features such as Knowledge Graph, spelling correction, synonyms and more.

This algorithm improves their distance and location ranking parameters.

It provides more relevant and accurate local search results.

Hummingbird Algorithm

Hummingbird’s strength is the ability to quickly analyze longer, more complex questions and provide the best answer to the searcher with the fewest possible clicks.

"Hummingbird" algorithm is a more human way to interact with users and provide a more direct answer unlike its previous versions Panda and Penguin.