A detailed analysis of the relevance of SEO's external chain construction

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Do Search engine optimization (SEO), the construction of external links mentioned more is the link to the relevance of the argument, after all, you are most of these external links to search engines to see, and search engines rely on the spider program to catch.

Remember, "Spider" is a Crawl "program", not "artificial intelligence". He will not use human judgment logic to judge relevance, but some "logic program", after all, the spider program is not complex (relatively).

Understand the above situation, I say my own views on "relevance" and building experience, the wrong place, but also please correct me.

The relevance of your Web page to the content in your Web page, the judgment in the Spider program:

Suppose your Web page is a new page that has just been done for less than 2 days and just submitted, spiders come crawling (or through other forms of links) According to the "Crawl index".

First, spiders come through a variety of connections to your Web page, and for him, the new page features are judged from the elements in the title tag in the head section of the page code.

Suppose the spider came to you this page, grabbed the title text in the page: My anime forum-new anime-new ideas! Spiders will first grab the text in the title as a reference, and then go from the page code to find the relevant "key words."

You can rest assured that spiders can judge some JS code and the label on the page, he will pay more attention to the text and Div block in the title section of the "key words", that is, a series of h1-h4. This also can verify everybody says, why the content in the H1-H4, will be higher than the other body text content weight reason. Then the spider will tilte in the body part of the most repeated number of words, designated as "Reference keywords" (of course, there is a repeat limit, the search engine will be set and embedded in the Spider program).

Then the spider itself will be based on "reference keyword" to judge "keyword extension" (according to the search engine related categories of commonly used data keywords and title in the keyword analysis), comprehensive above, to determine the general "key words" as the next page crawl reference.

Next, the spider calculates the number of all keywords that appear in the Web page code (this simple data-computing function or some) as a base. Then calculate the number of "keywords" in the body tag, as a molecule (sweat, think of what word, popular first). And then, you get the keyword density of this page.

After the density comes out, the search engine itself will have a standard judgment (artificially designed parameters), there is a level,?-? is the most reasonable,?—? is general,?—? is the worst, the standard is changing, in short, according to the data for a period of time to adjust (is to let you at intervals to make a return to the heart).

Well, the density of the judge came out after the comparison of the key words on this page.

Based on the key words in Tilte, it combines the reference of "expanding keywords", and compares the "key words" in the body part to compare their differences in each text. (for example, search engine set the key word for "anime", and the body text has: Animation forum, new anime-and so on, the difference is also graded, the difference is not big, become a long tail keyword, the difference is large, was discarded as the search keyword for this page, this and "keyword density" method of judging the same. In this way, the page long tail words and search keywords are determined.

When the density and the page keyword difference these 2 items obtained 2 results, there will be a weighted calculation formula (the engine itself, also regularly based on data adjustment), to get a "correlation" score (similar to the Baidu Index algorithm), so as to determine the page keyword, determine the content of the page and the relevance of the key words.

The relevance of the page's keywords and page content is so.

So, how does the relevance of external links be judged? Okay, let's talk about this. Enter the 2nd part

External connections and Web page relevance judgments:

One-way Link:

He links to your pages on his web page, the link anchor text description of your site must be related to the keywords he links to your page, or similar, the spider's method of judging and the first part, just the beginning of the "keyword" reference, become on his page, your page link road text.

In other words, the relevance of this page and your site is how high, this spider how to judge?

This link anchor text becomes a bridge and reference.