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This article uses simple and easy-to-understand examples to introduce what is the difference between secondary domain names and primary domain names. The content is very detailed. Interested friends can refer to it and hope to help everyone.

In the domain name system, first-level domain names and second-level domain names are often contacted when building websites. Here we will introduce the difference between the second level domain name and the first level domain name.

About First Level Domain Names

A first-level domain name is also called a top-level domain name. It should be noted that www.baidu.com is not a first-level domain name strictly speaking, it is only a second-level domain name, that is, www is just a host name.

A true first-level domain name is composed of a valid string + domain name suffix. Therefore, baidu.com this form of domain name is a domain name. Baidu is the domain name body,.com is the domain name suffix. It can be a. net domain suffix or any other domain suffix.

About Secondary Domain Names

A second-level domain name is actually a hostname under a first-level domain name. As the name suggests, a string is added in front of a first-level domain name, such as a.baidu.com, which can have the same function as a top-level domain name. And by setting, you can have exactly the same function as a top-level domain name. However, there is a difference between a primary domain name and a secondary domain name.

The difference between a second level domain name and a first level domain name

Second-level domain names are dependent on the existence of first-level domain names, that is to say, if top-level domain names disappear, second-level domain names will no longer exist. On the contrary, the website of the secondary domain name is not done, and the main domain name website is not affected.

As for the search engine for a domain name included, is also better than a lot of secondary domain names, the distribution of weight is also biased towards the top-level domain name, the beginning of the choice of top-level domain names, included will be relatively slow, but after a period of time, search engine recognition, the top-level domain name included will turn good. The second level domain name is included quickly at the beginning, but it will gradually stop, so it is said that the first level domain name is better than the second level domain name in terms of weight.

What is the difference between a second-level domain name and a first-level domain name? I hope the above content can be of some help to everyone and can learn more knowledge. If you think the article is good, you can share it so that more people can see it.

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