Blog seo-Search engine Working principle Introduction

Resource recommendation

Zac Published "seo actual combat password" is a good book SEO primer, but I bought in Dangdang e-book by DRM copyright protection , can not share with you.

I found this book on the internet. Understanding the search engine chapters is very detailed and easy to understand. The links are as follows:

Http://www.21jn.net/seo/zac/zac.html

Objective

seo by the English search engine optimization abbreviation, Chinese translation for "Search engine optimization." SEO refers to the natural search results from the site traffic technology and process, is to understand the natural ranking mechanism of the search engine on the basis of the site for internal and external adjustment optimization, improve the site in search engine keywords natural ranking, to obtain more traffic. The purpose of the blog SEO is to improve the number of blog visits and popularity.

If you want to do seo, you must simply understand the search engine working principle and natural ranking mechanism.

Search engine work process is very complex, I here only briefly describe how the search engine to achieve the page ranking, and I just for the registration of blog SEO need to know the knowledge. This article describes the content relative to the real search engine technology, is only fur , but the blog SEO is enough to use. I try to be the easiest way to understand and not design algorithms and esoteric theoretical knowledge.

The working process of a search engine can be divided into three stages: crawling and crawling, preprocessing, and returning search results.

First, crawling and crawling

Search engine spiders through the tracking link to access the Web page, get page HTML code into the database.

search engine Spider How to crawl Web pages?

Find a link → download this page → add to temporary library → Extract the links in the Web page → in the download page → loop.

First, the search engine spiders need to find links, as to how to find the simple, is through the link to find links. Its approach has depth priority and breadth first. Of course, our registered blog basically does not consider the site directory structure of the problem. Usually the site structure is usually divided into the following three levels: Home--Channel--article page. The ideal site structure should be more flat, from the homepage to the content page as few as possible, so that the search engine processing, will be more simple.

For the blog SEO, to let spiders crawl our article, you must import links for the article. Whether it's an external link or an internal link to the same blog , you can increase the probability that spiders will find the web and crawl. Otherwise the spider has no chance to know the existence of the page.

For example: I write a series of blog like to connect related articles in the blog post, although the beginning of my article has not been included in Baidu. One day, there is an article on the HTTP Protocol analysis tool on the blog Park - The original essence area, because of its high page weight, Baidu Spider crawl also more frequent. With the inclusion of this blog post, all my posts have been included in Baidu.

Second, pretreatment

Span style= "color: #000000;" > page pagerank value calculation keywords and page dependencies, trustrank value calculations such as processing for the rank program to call. This is the key for search engines to return search results in a very short period of time. One of our most concerned is pr values and correlations.

PageRank principle

Understand PageRank is to understand why SEO requires a certain number of high-quality outside the chain.

PageRank can image of the analogy: A page is ranked by the link to " vote " results, and is the weight of different votes, excellent site for you vote for you will be ranked more front, spam site is not what use. Therefore, the high quality of the chain is very helpful to SEO .

After the page PageRank value is calculated, the page gets a ranking that is unrelated to the page theme (content).

PageRank Value determinant factor: (from Wikipedia)

PageRank works by counting the number and quality's links to a page to determine a rough estimate about how important th E website is. The underlying assumptionis, more important websites be likely to receive more links from other websites .

The main idea of the above is that thePR value is determined by pointing to the quantity and quality of the link to the page.

How to understand the quality of links ?

If a Web page has a high PR value (High importance), then the quality of the connection that appears within that page is better. Usually some authoritative website PR value is higher.

This also means that the importance of the Web page is passed. The PR value of a link is determined by the PR value of the page on which the link is imported , and the higher the PR value of the linked page itself , the higher the PR can be passed out.

Relevance of keywords to pages

Understanding the relevance of the keyword to the page is to understand why SEO requires Good article anchor text and keyword optimization.

Influence page and search keyword relevance factors include link analysis, word frequency and density, keywords location and form, keywords distance and other factors, including link analysis accounted for a significant proportion.

have to mention is the founder of Baidu Li's super-chain analysis Patents .

Set up a link thesaurus, record links anchor text Some relevant information, such as the anchor text contains which keywords, the page index of the link, the number of links containing the specific anchor text, the link to the specific keyword to which pages. The thesaurus contains not only keyword prototypes, but also other derived keywords of the same stem.

Based on these linked data, especially anchor text, the relevance of a link-based Web page is calculated. When users search, the resulting link-based correlation is combined with traditional relevance based on keyword matching to get a more accurate ranking.

The more pages with the search term as the anchor text of the import link (this sentence to carefully understand), the more relevant page relevance. Link analysis also includes the link source page itself theme, anchor text around the text, such as a clothing class site has a link to the Java Language Learning page, then this page and search keyword relevance is low.

Third, return search results

After the user enters the keyword, the ranking program calls the index library data , matches the keyword , and then formats the search results page according to a certain format. This is because the previous preprocessing, the search engine can return the result in a very short time.

Baidu Search Results display format

Natural result Format parsing

Baidu nature results in a record format as follows:

The first line is the page title, usually taken from the title tag in the HTML Code of the page (title tag). This is the most visible part of the results list, where the user clicks on the title to access the corresponding page. Therefore, the page title label of the wording, regardless of the ranking or click-through rate is of great significance.

Line second to third is the page description. The page description is sometimes taken from the description label (DESCRIPTIONTAG)in the HTML of the page, and sometimes the content is dynamically crawled from the page's visible text. So the display of what page description text is a user query to decide.

The line is Baidu snapshot and Baidu praise rate of praise, note this rate is the entire site's praise rate, rather than a single page.

Blog seo-Search engine Working principle Introduction