Search engine spiders are software programs that sift through content on web pages and build lists of words that appear on those pages. This process is called web crawling. The program visits page after page, following each link and recording the content of each page as it goes along like a spider crawling through the pages. This content is then added to the search engine's index.
A spider, also known as a robot or a crawler, is actually just a program that follows, or "crawls", links throughout the Internet, grabbing content from sites and adding it to search engine indexes.
Search engine spiders are the software which indexes the web pages and follows the links on those web pages to index them also.
A Web crawler is a computer program that browses the World Wide Web in a methodical, automated manner or in an orderly fashion and other.
A spider, also known as a robot or a crawler, is actually just a program that follows, or "crawls", link throughout the internet, grabbing content from sites and adding it to search engine indexes.
These search engine spiders will not crawl the webpage you put under robots.txt as nofollow. One of the program written by the search engine to view the page fully.
A spider, also known as a robot or a crawler, is actually just a program that follows, or "crawls", links throughout the Internet, grabbing content from sites