What are first-level domain names and second-level domain names? What is the difference between a first-level domain name and a second-level domain name?

For website optimization SEO personnel, there are many standard words that we need to remember, such as: first-level domain name, second-level domain name, dynamic link, preferred domain, etc., but for many novice SEO personnel, it sounds confusing. So what are the first-level domain name and the second-level domain name? What is the difference between a first-level domain name and a second-level domain name? Today, Dongguan SEO editor will share it with you.

What are first-level domain names and second-level domain names?

In fact, the first-level domain name is the top-level domain name. These are just two names for the same domain name. Many friends think that yunmajp.com is a top-level domain name and www.yunmajp.com is a first-level domain name. In fact, this is a wrong understanding. yunmajp.com is a top-level domain name and a first-level domain name. You need to pay when registering a first-level domain name, while the second-level and third-level domain names are extended based on the first-level domain name and are free.

The second-level domain name is derived from the first-level domain name, such as: yunmajp.com (first-level domain name), and a domain name in the form of ask.yunmajp.com is a second-level domain name. Of course, second-level domain names and third-level domain names are free, but most servers limit the number of second-level domain names. This can result in general resolution, and the specific form of the second-level domain name is mainly prefixed with www. Domain names like www.yunmajp.com, as well as second-level domain names with customized prefixes according to your own needs, such as host.yunmajp.com.

In fact, www.yunmajp.com and host.yunmajp.com are both second-level domain names, and they are equal. It’s just that people are accustomed to using the second-level domain name with www as the prefix as the main domain name entrance of the website, which is also easier for everyone to remember.

What is the difference between a first-level domain name and a second-level domain name?

The second-level domain name exists dependent on the existence of the first-level domain name. That is to say, if the top-level domain name disappears, the second-level domain name will also cease to exist. On the contrary, if the second-level domain name website is no longer in operation, the primary domain name website will not be affected.

As for the search engine's inclusion of first-level domain names, it is much better than second-level domain names, and the distribution of weights also tends to favor top-level domain names.

If you choose a top-level domain name at the beginning, the inclusion will be slow, but after a period of time, the search engine will recognize it and the inclusion of the top-level domain name will improve. The second-level domain name will be included quickly at the beginning, but will gradually slow down. Therefore, the first-level domain name is better than the second-level domain name in terms of inclusion and weight.

The above is what are the first-level domain name and the second-level domain name? What is the difference between a first-level domain name and a second-level domain name? If you have any questions about the above information, please contact Feng Chao for answers.