Web spider is a bot of search engine program or automated script which browses the world wide web in a methodical automated manner. This process is called web crawling or spidering.

Web crawler means is a programing language like google panda and penguin for reading your site

Web design Cardiff

It is google bot which scans the www automatically and download the copy of its content to index

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.

A web crawler (also known as a web spider or web robot) is a program or automated script which browses the World Wide Web in a methodical, automated manner. This process is called Web crawling or spidering. Many legitimate sites, in particular search engines, use spidering as a means of providing up-to-date data.

A spider also known as web crawler is a program that visits Web sites and reads their entire pages and other information for search engines.

thank you so much very usefull

A web crawler (also known as a web spider or web robot) is a program or automated script which browses the World Wide Web in a methodical, automated manner. This process is called Web crawling or spidering. Many legitimate sites, in particular search engines, use spidering as a means of providing up-to-date data.

A program that automatically fetches Web pages. Spiders are used to feed pages to search engines. It's called a spider because it crawls over the Web. Another term for these programs is webcrawler

Web spider is a search engine algorithm in Google,yahoo,bing.
the web spider crawl your web site by an search engine and store in to your database.

example : google crawl my site the keyword like web design cardiff
web design agency
web design London and store into them data base while people search in to google it display site by the name of mobohttp://mobo.co.uk/

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." Spiders are typically programmed to visit sites that have been submitted by their owners 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" spanning a large area of the "web." Spiders can crawl through a site's pages in several ways. One way is to follow all the hypertext links in each page until all the pages have been read.

A web crawler (also known as a web spider or web robot) is a program or automated script which browses the World Wide Web in a methodical, automated manner. This process is called Web crawling or spidering. Many legitimate sites, in particular search engines, use spidering as a means of providing up-to-date data.