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What are Spiders, Robots and Crawlers ?

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  • What are Spiders, Robots and Crawlers ?

    hello friends,


    I want to know that What are Spiders, Robots and Crawlers and what are their functions? explain friends..
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  • #2
    They are all the same known with different names. They are search engine programs that are used to read through webpage sources to cache and index them in search engines.
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    • #3
      Search engines are getting better at understanding what a person means from the words they type, so their writers focus on topics and answering questions, and don’t sweat the “exact match” text quite as much. I know that paidforumposting.com team of writers are the best for generating traffic to web sites.

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      • #4
        Web content that is indexed by search engine sites will be constantly updated, fresh, and very relevant. This is what robots, crawlers and spiders are all about.
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        • #5
          any site is cached by Google spiders & bots for ranking.
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          • #6
            A spider is a program run by a search engine to build a summary of a website’s content (content index). Spiders create a text-based summary of content and an address (URL) for each webpage.

            Robots.txt is a text (not html) file you put on your site to tell search robots which pages you would like them not to visit. Robots.txt is by no means mandatory for search engines but generally search engines obey what they are asked not to do. It is important to clarify that robots.txt is not a way from preventing search engines from crawling your site (i.e. it is not a firewall, or a kind of password protection) and the fact that you put a robots.txt file is something like putting a note “Please, do not enter” on an unlocked door – e.g. you cannot prevent thieves from coming in but the good guys will not open to door and enter. That is why we say that if you have really sen sitive data, it is too naïve to rely on robots.txt to protect it from being indexed and displayed in search results.

            A search engine crawler is a program or automated script that browses the World Wide Web in a methodical manner in order to provide up to date data to the particular search engine. While search engine crawlers go by many different names, such as web spiders and automatic indexers, the job of the search engine crawler is still the same.
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            • #7
              A spider is a program run by a search engine to build a summary of a website’s content (content index). Spiders create a text-based summary of content and an address (URL) for each webpage.

              When a person searches, the keyword(s) they enter are compared with the available website content indexes. Due to the large number of webpages indexed, direct text-only-matching is rare, rather search engines use sophisticated logics (algorithms) to rank potential matches. For example, the underlying information hierarchy of a webpage (semantic markup) may be factored into the ranking a webpage is assigned.

              A spider will only index the text-based content of your website. Images (such as photos or graphical-text), video and Flash elements require supplementary HTML-text to be ‘seen’ by a spider.

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              • #8
                Search Engine Spiders, Search Engine Robots and Web crawlers

                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.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". A spider will only index the text-based content of your website.Images ,videos and Flash elements require supplementary HTML-text to be 'seen' by a spider.

                A crawler is a program that visits web sites and reads their pages and other information in order to create entries for a search engine index.Crawlers are typically programmed to visit sites that have been submitted visited and indexed.Crawlers are called "crawlers" because they crawl through a site a page at a time,following the links to other pages on the site until all pages have been read.

                A "robot" or "bot" is a program that operates as an agent for a user or another program or simulates a human activity.On the Internet,the most ubiquitous bots are the programs,also called spiders,or crawlers,that access web sites and gather their content for search engine indexes.
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                • #9
                  Spider: A browser that downloads website pages.

                  Crawler: A Program that follows web pages automatically.

                  Robots: A robots.txt file is used to have the funds for directions about the Web site to Web robots and spiders.

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