Tao: The SEO knowledge reflected from the work principle of the search engine (on)

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In my first contact with SEO, I have to carefully observe the search engine. On the one hand do SEO is by the search engine and live, we have to put the eldest brother to serve well, and on the other hand to see how he works, how he achieved tens of thousands of pages in a second to achieve orderly ranking. Today, in fact, there is a clear concept of these problems.

Want to have a certain search engine rankings, light to know the online SEO basis that is not enough. I have met some friends to do their own station rankings, but he did not know how to do up. He told me to do the chain, update the update article went up. We can't rule out the possibility that the key word competition is different. But I have encountered the most or do ranking, but soon fell again, do not know how to maintain the rankings. Nonsense also don't say much, follow Tao's thought step by step to go down.

First of all we have to mention a SEO proper term "spider". This is also a program used by every search engine to crawl and access pages, also called robots. Here I explain the name of the spider: In my opinion, it is called a spider. Because spiders are accessing every Web site on the Internet, along with the link code on the Web. And each site of these links is actually like a very complex web, spiders to do is to crawl information on this web, this form is very similar to the Spider spider, so there is a figurative metaphor.

Have we got a sense of the term spider? Some of the original search engine must update the database and ranking order is to rely on such a program to crawl, retrieval will be updated periodically. So that is to say: Want to let our website have rank, is not must first let search engine collects our station, want to let search engine collect, is not to let spider spider to climb our station first. In fact, there will be a process, how to let spiders crawl our site Here I would like to say:

In general we call this the "link bait". That means attracting spiders to crawl our site. Common for example to go to the site we have just done to the search engine, through the high weight of the site to publish links, through the search engine seed station to do guidance, and so on, these are more useful methods.

Let's take a look at the spider's habits, so that we can better master it, and constantly feed him, train spiders to visit the site's speed and habits to improve the weight of the site to get a certain ranking

Speaking of spiders, we have to have a concept of "depth first, breadth first". We've talked about spiders in the end, and it's the link between the site and the site that pulls him crawling. Do you have any impression in the course of reading some of the basics of SEO, have said that a site structure must be tree-shaped, and the directory level should not be too deep. In fact, this argument comes from the depth of priority and breadth first.

Depth First: For example, when spiders visit a link to a Web site, he will keep crawling down the link until there is no more links before returning to the first page and then crawling along another link. Like spiders visiting our homepage, a crawling habit from it is bound to crawl from a column in the navigation, possibly crawling to our final page and returning again.

Breadth First: This is a little different from depth, the way it behaves when a spider finds multiple links on a page, he crawls the first level of the link and then climbs the next layer along the link found on the second-tier page. Now I'll show you a picture and you'll see

In fact, in our reality, spiders tend to combine breadth first with depth first, so that they can take care of as many sites as possible (breadth first) and take care of the inner pages of the one by one-part site (depth first)

With this data capture principle, search engines will be able to crawl the spider back through the information first to do a preliminary collation and storage, and each information given a specific number.

The above is just talking about the search engine's some basic crawl situation, for his further is how to deal with, please continue to focus on the SEO knowledge from the principle of work (in)

Reprint please specify the blog from Tao: http://www.nb-seoer.com/post/153.html