In this guide we’re going to provide you with an introduction to how search engine work? This will cover the processes of crawling and indexing as well as concepts such as crawl budget and PageRank.
Search engines like google work by crawling hundreds of billions of pages using their own web crawlers. These web crawlers are commonly referred to as search engine bots or spiders. A search engine navigates the web by downloading web pages and following links on these pages to discover new pages that have been made available.
How Search Engine Work?
Search engines are your portal to the internet. They take masses of information on a website, break it down, and make decisions on how well it answers a specific query.
To be effective, search engines need to understand exactly what kind of information is available and present it to users logically. The way they accomplish this is through three fundamental actions: crawling, indexing, and ranking.
How Google Search work?
Google collects information from many different sources, including:
- Web pages,
- User-submitted content such as Google My Business and Maps user submissions,
- Book scanning,
- Public databases on the Internet,
- and many other sources.
Every time you search, there are thousands, sometimes millions, of webpages with helpful information. How Google figures out which results to show starts long before you even type, and is guided by a commitment to you to provide the best information.
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In short version, Google follows three basic steps to generate results from web pages:
The first step is finding out what pages available on the web. Google constantly search for new pages and add them to its list of known pages. Other pages are discovered when Google follows a link from a known page to a new page. Still other pages are discovered when a website owner submits a list of pages like sitemap, for Google to crawl. Once Google discovers a page URL, it visits the page to find out what’s on it. Google renders the page and analyzes both the text and non-text content.The better that Google can understand your site, the better we can match it to people who are looking for your content.
After a page is crawled, Google tries to understand what the page is about. This process is called indexing. Google analyzes the content of the page, catalogs images and video files embedded on the page. All this information is stored in Google Index. The Google Search index contains hundreds of billions of webpages and is well over 100,000,000 gigabytes in size.When google index a webpage, it add it to the entries for all of the words it contains.
When a user types a query, Google tries to find the most relevant answer from its index based on many factors. Google tries to determine the highest quality answers.With the Knowledge Graph, we’re continuing to go beyond keyword matching to better understand the people, places and things you care about. To do this, we not only organize information about webpages but other types of information too.
What is Search Engine Optimization
The algorithms used to rank the most relevant results different for each search engine. For example, a page that ranks highly for a search query in Google may not rank highly for the same query in Bing.Google doesn’t accept payment to rank pages higher, and ranking is done programmatically.
This is a simple guide how search engine work? We will explain this in detail in subsequent articles.