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

Jul 12, 2022
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What is the difference between a primary domain name and a secondary domain name?

(1) The composition is different

  1. Domain name: A domain name is the name of a computer or computer group on the Internet consisting of a string of names separated by dots.

  2. Second-level domain name: The second-level domain name is the penultimate part of the domain name and belongs to the domain name divided from the main domain name.

(2) The scope is different

  1. Domain name: Domain name is mainly used for Internet infrastructure database.

  2. Second-level domain name: Second-level domain name is suitable for large websites. Because the use of second-level domain names can shorten the length of the URL path.

(3) Different functions

  1. Domain name: The domain name identifies the computer during data transmission, instead of remembering the IP address string that can be directly read by the machine.

  2. Second-level domain name: Second-level domain name has a very good effect on inclusion. The whole site is intertwined and connected, which can be retrieved by search engines and automatically generate sitemaps.

  1. Introduction to the main domain name

Domain name, domain name for short, is the name of a computer or computer group on the Internet composed of a string of names separated by dots, used to identify the electronic location of the computer (sometimes also referred to as geographic location) during data transmission.

Because IP addresses are pure numbers and difficult to remember, domain names are generally used instead of IP addresses on the Internet. The domain name is composed of several English letters (case-insensitive), numbers or minus sign "-", and is separated into several parts by a decimal point ".". The domain name system adopts a hierarchical structure, which is stratified according to geographic or institutional domains, and each level is separated by a decimal point.

The first-level domain name consists of the main domain name plus "." plus the top-level domain name, namely (main domain name) + (.) + (top-level domain name).

  1. Introduction to Second-level Domain Names

Second Level Domain (SLD) has different meanings under the international top-level domain name or the national top-level domain name.

The second-level domain name under the international top-level domain name. The second-level domain name generally refers to the online name chosen by the domain name registrant, such as "yahoo.com"; commercial organizations that go online usually use their own trademarks, trade names or other business signs as their online names , such as "microsoft.com".

The second-level domain name under the national top-level domain name generally refers to the sign indicating the category and function of the registrant similar to the international top-level domain name. For example, in the ".com.cn" domain name structure, ".com" is the second-level domain name placed under the national top-level domain name ".cn", which means a commercial organization, and so on.

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