what is spiders in SEO?

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).

Spider is nothing but search engine bot, each and every search engine has its own bot. Bot crawl the data from the website and store into their database. Google sends out what's affectionately known as a 'spider' to 'crawl' the web, going from link to link creating a web and cataloging or indexing what it sees.

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. The major search engines on the Web all have such a program, which is also known as a "crawler" or a "bot."

A search engine uses an algorithm that can be referred to as a 'crawler', 'robot' or 'spider' which follows an algorithmic process to determine which sites to crawl and how often.

A Spider will crawls the content and pages of your site in web. It is also called crawler.

Web spider is a search engine program that is responsible to read through webpage sources and provide information to search engines.

The search engine bot which crawls the website for the entered search term is also called as spider.

Spiders are web crawlers used to crawl the webpages.