What is a second-level domain name? What is the difference between a second-level domain name and a second-level directory? What are their advantages and disadvantages?

In the process of analyzing the website, we usually find that a site uses a lot of second-level domain names, and even all columns use one second-level domain name. I believe many people are confused about the second-level domain name of the website. There are some confusions about the necessity of doing this, the impact on SEO, etc. Today Fuji.com will briefly talk about the main domain, secondary domain and secondary directory. Of course, people who engage in SEO are no strangers to these concepts, so what is the relationship between the three?

The primary domain name we are talking about here usually refers to the main site of a website, and the secondary domain name is the sub-site. Some are divided by region, such as the Yinchuan branch of Ganji.com, and some are columns. It is independent and becomes a sub-site, but it has a subordinate relationship with the main site in terms of content. It is just because the content is too rich that it cannot be carried by the secondary directory and becomes an independent site. Of course, there is also the development of content that is completely unrelated to the main site. The sub-site may not even have an entrance to this site in the main site, but it only exists under the same IP. The secondary directory is a sub-column under the main site.

For SEO, it is good to flatten the website structure, which is conducive to spider crawling and inclusion. Therefore, when the secondary directory cannot carry article pages and more sub-directories need to be opened, you may consider establishing an independent website.

So what are the advantages and disadvantages of using second-level domain names and second-level directories?

1. The use of second-level domain names can only increase the weight of the main site by links pointing to this site. But at the same time, the main site will also pass on the weight, and the two offset each other. I don’t know how much it will increase the weight of the main site. Probably because more links from sub-sites to the main site will play a greater role in increasing the weight of the main site. Fuji.com believes that the existence of a large number of sub-sites (of course affiliated with the main site) will disperse the weight of the main site.

2. The use of secondary directories will increase the weight of affiliated sites, because spiders will spend more time staying on this site. The longer the stay time, the higher the weight. In addition, the more included, the higher the weight. high. However, the content carried by the secondary directory is limited. If you want to flatten, you have to open more secondary directories. In this case, the weight of some directories that require high weight will inevitably be dispersed.

What are the advantages and disadvantages of using second-level domain names?

1. The primary domain name belongs to someone else, while the secondary domain name belongs to you.

3). If the primary domain name of the second-level domain name you use is punished, your website will also be implicated;

2) When the domain name provider ceases business, Then the website you have worked so hard to operate will be in vain with the loss of your domain name.

1) When ranking website traffic, all your traffic will be attributed to the top-level domain name you rely on. ps: Alexa’s ranking defaults to the top-level domain name.

2. The advantages of using your own primary domain name to develop secondary domain names:

1) When included by search engines, the secondary domain name is considered an independent website and can expand the number of included pages. quantity. In other words, as long as there is no cheating, a second-level or ** domain name can include at least one page, and the development of tens of thousands of second-level domain names will greatly increase the number of included ones.

2) When a website is ranked, all traffic is attributed to the top-level domain name it relies on.

3. Advantages of using second-level domain names of other people’s primary domain names:

1) In last year’s virtual host keyword rankings, there was a website that was very strange. His main website was Arabic, and the second-level domain name is Chinese. This second-level domain name has no external links and very few inclusions, but it ranks very high. The reason is that its main website has a PR of 7 and a very large traffic.

2) You can use the resources of the main domain name to quickly improve your ranking.

3) Some people use blogs for ranking, mainly using the resources of the main website.

In fact, there are no good or bad ways to use second-level domain names. If you find the benefits of using second-level domain names, then you don’t have to worry. Therefore, Fuji.com reminds you that the use of second-level domain names must be based on the conditions of your own website. Website internal link website optimization