A search engine spider is an intangible program, but it's called a spider because of the way it works to sort results on the Web. The spider weaves a web of indexed web pages by analyzing the HTML and other elements of each page. Certain algorithms are used to promote a hierarchy for web results. A search engine spider, also known as a web crawler, is an Internet bot that crawls websites and stores information for the search engine to index.
A spider is a program that visits websites and reads their pages and other information to create entries for a search engine index. Major search engines on the Web have such a program, which is also known as a crawler or bot. Usually, spiders are scheduled to visit sites that their owners have submitted as new or updated. Entire sites or specific pages can be selectively visited and indexed. Spiders are called spiders because they usually visit many sites in parallel at the same time, their legs span a large area of the web.
Spiders can crawl the pages of a site in a number of ways. One way is to follow all the hypertext links on each page until all the pages have been read. Web search engines and some other websites use crawling software or web spider to update their web content or the indexes of the web content of other sites. Web crawlers copy pages for processing by a search engine, which indexes downloaded pages so that users can search more efficiently. If you have a personal connection, such as at home, you can run an antivirus scan on your device to make sure it is not infected with malware.
If you are in an office or on a shared network, you can ask your network administrator to perform a network scan for infected or misconfigured devices. Search engines go from one web page to another, following the links found on each page. This process is known as web crawling. The program it tracks is known as a spider or bot. Once a spider finds a web page, it places it in the search engine index.
When a search is performed, the results are extracted from the index and sorted according to the search engine algorithm. Identification is also useful for administrators who are interested in knowing when they can expect their web pages to be indexed by a particular search engine. Larger search engines, such as Google, have specific bots for different approaches, including Googlebot Images, Googlebot Videos, and AdsBot. TitanBot, the Titan Growth spider, was created to copy the way search engine spiders crawl and extract data. When you type a query in the search bar, the search engine searches its huge database and uses algorithms to filter what is relevant to your query. All of this information is used to help search engines such as Google, Yahoo and Bing determine where pages should rank in SERPs (search engine results pages).
This is why having links on your website, and, even better, on other websites that link to yours, is so useful for search engines to find your website. When you search for something on Google, those pages and pages of results can't materialize out of thin air. Similarly, a web crawler creates an index that a search engine uses to find relevant information in a search query quickly. Search engine spiders crawl the Internet and create website queues to investigate further. While most website owners want their pages to be indexed as widely as possible in order to have a strong search engine presence, web crawling can also have unintended consequences and lead to a compromise or data breach if a search engine indexes resources that shouldn't be publicly available or pages reveal potentially vulnerable software versions. Since search engines always want to deliver the most recent and relevant data, search engine spiders constantly crawl the web for new information and updates to add to the library. Given the current size of the Web, even large search engines cover only part of the publicly available part.
Search engines need information from all sites and pages; otherwise, they wouldn't know which pages to display in response to a search query or with what priority. In fact, it is estimated that only 40-70% of the Internet has been indexed by searches (which is still billions of pages).