FAQ Analysis of keyword density in SEO

What is SEO? Accustomed to use the search engine friends will naturally in Baidu (baidu.com), Google (google.cn), Yahoo (yahoo.com) on the input keyword "SEO", the habit of using English search friends will be in the relevant English search engine, by using these search engines, will get the SEO keyword related to the results of the Web page, by looking at these pages, usually understand what the SEO means? will have a general understanding of SEO.

SEO is the abbreviation for Search Engine optimization, described in English is to use some technics to make your website in the top places Somebody is using search Engine to find something, translated into Chinese is "search engine optimization", generally referred to as search optimization. Related to the search knowledge also searches Engine positioning (search engine positioning), search Engine ranking (search engine rankings).

SEO's main job is to understand how all kinds of search engines crawl http://www.aliyun.com/zixun/aggregation/8400.html "> Internet pages, How to index and how to determine the ranking of search results for a particular keyword to optimize the Web page, so as to improve the search engine rankings, so as to improve the number of Web site visits, and ultimately enhance the site's sales capacity or the ability to promote the technology.

Below, we focus on SEO optimization keyword Density FAQ:

What is the keyword density?

To correctly understand the keyword density, first of all to understand what is the keyword? The key word is the entry that the searcher enters in the search engine interface when looking for information, product or service. The general rule is that the longer the keyword, the more accurate the information returned from the search engine index.

Keyword density (Keyword density) is also called the keyword frequency (Keyword Frequency), which is essentially the same concept, which is used to measure the total number of keywords appearing on the Web page and the proportion of other words, generally expressed as a percentage. Relative to the total number of words in the page, the higher the frequency of keyword occurrence, then the greater the density of keywords. As a simple example, if a Web page has 100 words, and the keyword appears 5 times, you can say that the keyword density is 5%.

Of course, this example is just an ideal simplification, it does not effectively include in the HTML code such as meta tags in the title, Keywords, Description, the image elements of the alt text, annotation text, etc., in the calculation of keyword density also have to take into account. Similarly, when calculating keyword density, it is not just the number of keywords appearing in the visible part of the Web page, but also the number of occurrences in the invisible section mentioned above. Also, consider stop Words, which often dilute keyword density to a large extent. Search engines are much more complex than this, but the basic strategy is similar to this.

The influence of keyword density on website ranking

Many search engines, including Google, Baidu, Yahoo! and so on keyword density as its ranking algorithm to consider one of the factors, each search engine has a set of keyword density of different mathematical formulas. Reasonable keyword density allows you to get a higher ranking position, the density is too large, play the opposite effect.

There are different allowable levels between different search engines in terms of the threshold value of the keyword density allowed before the penalty is imposed. For excessive optimization, such as keyword spam, different search engine tolerance threshold is not the same, from large to small ranked roughly in turn is google,msn, then Baidu, Sogou, iask,yahoo! the lowest.

The threshold value of keyword density

What is the best keyword density? keyword density is a vague concept that does not have an exact formula to limit its density. Search engine density control is different, even the same search engine, the size of the keyword density of different sites can allow the tolerance threshold is not the same, such as the same page, Sina, CCTV's website density of 20% may not have anything, your estimate is immediately blocked. This also involves the search engine's trust value problem, in this first do not prepare to repeat.