It is no secret that there can be, quite literally, trillions of results matchings for your search engine queries. For most people in this instant gratification world, all they want is the exact results to their queries handed to them in a quick and tidy package. Nothing more, nothing less. But have you ever taken the time to wonder how these very efficient search engines come up with the exact results every single time? A good understanding of the process of how search and index factors work can help us not only to better understand the digital world in which we live, but it can also help people who engage in commerce to better identify,understand and cater to the their customers. |
Before we get into this let us first understand what a web crawler or a web scraper is. As the very name suggests, a web crawler is an Internet Bot which systematically browses the world wide web for the purpose of Web Indexing ( it’s a process of adding web pages into Google search engine database). Crawler’s or scrapers are apparently called so asthey crawl through a site a page at a time. Entire sites or specific pages can be selectively visited and indexed. It also helps safeguard one’s content against duplicity. Crawlers would also help in validating HTML codes and checking links.
Search engines use web crawling software to update the web content. It, therefore, forms a major part of Website Development and overall Internet growth. The first Internet bot is inkling —a crawler bot with artificial intelligence, created by Andre Gray and debuted on the Internet on August 8, 1988. Without "inkling",and the many bots that followed in its wake, there could not have been any search engines and the overall growth of the Internet would have been significantly smaller.
In short, a web crawler is just a script/lines of code which does the following AUTOMATICALLY:-
A- Go to the website
B- Extract the details you want
C- Output the data in some format ( JSON,CSV,XLSX,XML,etc.)
Now coming back to the topic i.e, HOW CRAWLER WORKS – its The spider(not literally) that begins its crawl by going through the list of websites that it visited the previous time. When the crawler/scraper visit a website, they search for other pages that are worth visiting. Web crawlers can link to new sites, note changes to existing sites and mark dead links. These web crawlers are also known as bots, automatic indexers and robots. Once you type a search query, these crawlers scan all the relevant pages that contain these words and turn it into a huge index
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