What is a spider?

[sneha1234]

Spider is an robot that travels the web examining the websites in order to add them to a search engine database and rank them according to the specific ranking criteria for that search engine. The spiders will periodically come back to your site once indexed in their database. That is why it is important to constantly refresh your content, because the spiders will stop coming to your site if your content remains the same.

[samdorjey]

It is an automated program. It crawl the webpages and index them in the search engine database.

[devin15]

Spider is a search engine robot that crawls the web and indexes the web pages they encounter. Only the webpages that are spiderable are included in search engine database and then later displayed in SERP.

[edword84]

I agree that Spider is a computer program which crawls the web and indexing site's pages. It can easily identify hidden text which human cannot.

[ackerlee]

It is a program that most search engines use to find what’s new on the Internet. Google’s web crawler is known as GoogleBot. There are many types of web spiders in use, but for now, we’re only interested in the Bot that actually “crawls” the web and collects documents to build a searchable index for the different search engines. The program starts at a website and follows every hyperlink on each page.

[Mithzi Rai]

A spider is a program that visits Web sites and reads their pages and other information in order to create entries for a search engine index.

[jayam]

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. Think of it this way. When you search something on Google, those pages and pages of results can't just materialize out of thin air.

[GeethaN]

A Web crawler, sometimes called a spider, is an Internet bot that systematically browses the World Wide Web, typically for the purpose of Web indexing (web spidering).

[yuva12]

Spiders are also known as bots, robots and crawlers. These are programs developed and programmed to scour the web automatically for various reasons most notably they are used to index web pages, for spam detection, and the like. They are also known as web robots, web crawlers, bots, internet bots.

[SKPglobal]

Google crawler Robots is called spider....

[ritesh3592]

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

[rickylarson]

Spiders are robots of search engines that crawl the website and distribute the link juice as the quality of links.

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[Saravanan28]

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. Think of it this way. When you search something on Google, those pages and pages of results can't just materialize out of thin air.

[RH-Calvin]

A spider is a Google automated program that is responsible to read through webpage sources and provide information to Google.

[godwin]

A spider is a computer program that browses the web on a step by step basis.

Other terms are web crawlers, ants, automatic indexers, bots, web robots, web scutters.

There is an initial list of basic URLs submitted to a SEO spider. These URLs are called seeds.

The crawler starts with indexing these seeds and detecting all the hyperlinks they contain.

When done, it adds new links to the list of URLs called frontier and then visits those new pages repeating the whole process all over again.