How Search Engine Works
A Search engine is a service software program that helps the searchers to find out the information for a particular search keyword or phrase through the World Wide Web. When a searcher enters keywords or a phrase into a search engine and they receive a list of results in the form of websites, images, videos, or other data that similarly match the search content. This list of content returned via a search engine to a searcher is known as a search engine results page (SERP). Simply we can say that search engines are machines that provide answers to any query. They not only give information but also discover and catalog all available content on the WWW(it can be web pages, PDFs, images, videos, etc..) via a process. It is known as “crawling and indexing”. they also order the contents by how it matches the query in a process.
Nowadays, there are many search engines available on the Internet, and each search engine has its own abilities and features. Archie is considered the first search engine which was used to search for FTP files. And the first text-based search engine is Veronica. Today, we use the most popular search engine is Google. Some other popular search engines include AOL, Ask.com, Baidu, Bing, DuckDuckGo, and Yahoo.
These are three primary functions of the Working of a Search Engine:
1. Crawling
2. Indexing
3. Running
Search Engine Crawling; Search Engine Crawling simply means “following your links”. It is a process in which search engines send out a group of robots to find newly added or updated content. Robots are also called crawlers or spiders. Through the Crawling process that is done by search engine bots to discover web crawler’s URLs and repeated visits of input of web pages.
"site:yourdomain.com" using this search operator we can make sure the site gets crawled and indexed in the SERPs.
Indexing; Indexing means placing a page. After search engine crawling has been done, the result gets put on to Google’s index, which means Crawling and Indexing is a step-by-step process. Indexing is the process of “adding webpages into the Google search”. In this process when search engine bots crawl the web pages and save a copy of the information on index servers and search engines show the results on search engine when a searcher performs a search query.
Search engine ranking; The ranking is the process search engines use to determine where a particular content should appear on a Search Engine Results Page. Simply we can say that ordering search results by relevance is known as ranking. PageRank is the first algorithm used to determine how a site is ranked, based on that site's backlink profile. It is done by counting the quantity and quality of links to a page and estimate that how important for the website.
In search engine crawling we use robots.txt files. These are the files that are located in the root directory of websites and it shows which parts of your site search engines should and shouldn't crawl. Using " yourdomain.com/robots.txt"
While crawling some errors occurs when a search engine tries to reach a result page on your website but fails at it. This situation is known as crawling errors. So our goal is to make sure that each and every link on our website leads to the correct page. Sometimes it might be a 301 redirect, but the page at the very end of that link should always return a 200 OK server response.
0 – Blocked by robots.txt
In ‘0’ status code in the bot indicates the lack of an HTTP response from the server. The status provides a clue as to exactly why no status was returned.
0 – DNS Lookup Failed
The website is not found at all, often because the site does not exist, or your internet connection is not reachable.
0 – Connection Timeout
In connection, a timeout occurs when the SEO robot struggles to receive an HTTP response from the server in a set amount of time.
0 – Connection Refused
In ‘Connection Refused’ it is returned when the SEO robot connection attempt has been refused at some point between the local machine and website.
0 – Connection Error Or 0 – No Response
The SEO bot is having trouble making connections or receiving responses.
200 – OK
There is no issue receiving a response from the server, so the problem must be with the content that was returned.
301- Moved Permanently Or 302 – Moved Temporarily
This means the URL has moved and been redirected to a different location.
400 – Bad Request, 403 – Forbidden Or 406 – Status Not Acceptable
The server cannot process the request or it is denying the SEO bot’s request to view the requested URL.
404 – Page Not Found Or 410 – Removed (Client Errors)
The server is indicating that the particular page has been removed.
500 / 502 / 503 – Internal Server Error (Server Errors)
The server is saying that it has a problem.
Ultimately, Search Engines have more importance because over 50 billion web pages are available on the web. The number of pages fluctuates daily. So, in this condition search engines have a role to prioritise and filter the information. Through this everyone can easily access and use the information on the web in seconds of time.
