What is google spider?

Search Engine is a spider also called a crawler or a bot that goes to every page or representative pages on every Web site that wants to be searchable and reads it, using hypertext links on each page to discover and read a site's other pages.
 
Spider is a programs which search engines use to crawl web pages for indexing.
 
Crawling is the process by which Googlebot discovers new and updated pages to be added to the Google index. We use a huge set of computers to fetch (or "crawl") billions of pages on the web. The program that does the fetching is called Googlebot (also known as a robot, bot, or spider).
 
Google spider is Google program that contain instructions to find and read through webpage source to provide a cache certificate to the webpage. They are also known as Google bot and crawlers.
 
A spider is a web based program that crawls each and every web page of a website and its information in order to create entries for a search engine index. Every search engine have its own crawler or a bot to check the updates of a website continuously. It is specifically called spider because it checks multiple sites in parallel at the same time. Spiders can crawl a web page in several ways.
 
Google spider or Googlebot is the process by which Googlebot discovers new and updated pages to be added to the Google index. We use a huge set of computers to fetch (or "crawl") billions of pages on the web. The program that does the fetching is called Google spider.
 
Crawling. Crawling is the process by which Googlebot discovers new and updated pages to be added to the Google index. We use a huge set of computers to fetch (or "crawl") billions of pages on the web. The program that does the fetching is called Googlebot (also known as a robot, bot, or spider).
 
Google spider is a hidden robot which crawl website pages any time and then after crawling website page robot send it to google indexer and then indexer arrange all data in data base with page category.
 
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