How the Spider is work?

Insect additionally called as bot, crawler or robot is an arrangement of PC program that peruses the World Wide Web in efficient and organized form too consequently check the site pages and site for refreshed substance and download a duplicate to its server farm to file.

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A spider releases thread. If it feels the thread has caught on to something, it clinches up silk & attaches it to starting point. The spider walks across the thread, releasing a looser one below it. It climbs to centre of loose thread & moves down to form Y-shape.

In SEO,These spiders "crawl" websites and gather as much information as they can, before relaying it to the search engine's servers.

You should use Google or Wiki to get a detailed explanation on this.

These spiders "crawl" websites and gather as much information as they can, before relaying it to the search engine's servers. These spiders scour the internet for new web content by checking sites already in their index for updates and links to pages they have never scanned before.