Web Crawlers, Spiders, various algorithms: what are they good for?

Panda - photo by PANPOTEID, FreeDigitalPhotos.net - How Search Engines Work In Practice - Web Crawlers, Spiders

Panda – photo by PANPOTEID, FreeDigitalPhotos.net

Nowadays, many people are talking about Google’s new algorithms, such as Penguin, Panda (with several updates), Hummingbird and you have to be prepared for these changes. If you are an expert and correct internet marketer and you know what these changes are about, you can avoid any penalty with simply keeping the rules.
On the other hand, my friends keep asking me how a search engine works in fact? I’ve decided to help them first with explaning this process.

So, I wrote this article today with the aim to help you in your higher understanding how the Search Engines actually work and the way they supply data to the shopper when initiating a search.

What do Web Crawlers or Spiders, GoogleBots expressions stand for?

Search Engines use spiders to index websites. Once you submit your web site pages – or posts – to a search engine by completing their required submission page, the search engine spider will “exit” and index your complete site. An Internet “Spider” is a computerized program, so-called Internet Bot that’s run by the search engine system. When a  spider visits a website, reads the content material on the actual web site, studies the positioning of Meta tags and likewise will observe the links the place the site connects to. The spider then returns all particulars back to a central depository, the place the information might be indexed and stored. It’s going to visit every hyperlink you’ve got on your web site and index those websites as well. Many of the spiders will only index a definite number of pages in your web site, so don’t create an web web site with a whole lot of pages (posts can exceed this number)!

Content Penguin - photo by Jenna Mackenzie, FreeDigitalPhotos.net - How Search Engines Work In Practice - Web Crawlers, Spiders

Content Penguin – photo by Jenna Mackenzie, FreeDigitalPhotos.net

The spiders will periodically return to the websites to examine them seeking any data which is newly added or has changed. The frequency of those visits is set by the moderators of the actual search engine. Nonetheless, e.g. by Bing you might give an advice and assign the – for you – greatest available time-periods.

A spider index is almost like a e-book which incorporates the desk of contents: not only the precise content material however the hyperlinks and references for every one among the websites it finds throughout its search.

For instance: Google, Excite, Lycos, Yahoo and more.

If you ask a selected search engine to locate information, it’s essentially looking by means of the index which has been created and never actually searching the Web. Totally different search engines produce totally different rankings as a result of not each search engine uses the same algorithm to search by means of the indices. Especially Google likes to provide animal names (I’ve mentioned above) to their new algorithms equivalent to Panda, Penguin, etc.

Humming Bird drinking nectar - photo by Michael Elliott, FreeDigitalPhotos.net - How Search Engines Work In Practice - Web Crawlers, Spiders

Humming Bird drinking nectar – photo by Michael Elliott, FreeDigitalPhotos.net

One of many gadgets that a search engine algorithm scans for is the density and placement of keywords on an online web page, however it might additionally detect non- pure or artificial key phrase stuffing or spamdexing. Then the algorithms – with the help of web crawlers, spiders – analyze the way in which how that pages hyperlink to other pages within the Web. By checking, the engine can determine what a web page is about. If the keywords of the linked pages are much like the keywords on the unique web page, the spider will take into account them to relevant and will enhance you Page Rank.

If you are really interested in this topic concerning web crawlers, spiders, algorithms and the process, you can learn more on What Does A Search Engine Do And Why page, on this site.
If you want to follow the changes of Google’s algorithms (from the year of 2000), refer to this article of MOZ:  Google Algorithm Change History.

I hope I could help with this little explanation and summary.

Thanks for reading!

Gyula Olah electrical engineer, author, publisher, the owner of SEO Service Guide site.

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