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

A domain name, also known as a domain name, is the name of a computer or group of computers on the Internet that is used to locate (and sometimes geographically) the computer during data transmission.

For example: "fuyeor com" is a domain name.

The number of levels of domain names is to see how many are behind the domain name"."A delimited suffix.

For example: "fuyeor com" has a to:"."The delimited suffix is a first-level domain name. where com is the top-level domain, or root domain name, domain extension.

The second-level domain name is the domain name that is hosted under the main domain name, which is the domain name one level to the left of the naked domain name. Generally speaking, a second-level domain name is a format like 3 ws (www).

For example: "www fuyeor com" has two toes"."The delimited suffix is a second-level domain name.

Because IP addresses are boring, long strings of numbers, to make them easy to remember, there are domain names, such as: "second-level domain names." fuyeor.root domain name" or simply "fuyeor" without a second-level domainroot domain".

where, "second-level domain name." fuyeor.The root domain name "fuyeor is the body of the domain name; The root domain name is the suffixes com, net, and cn.

A top-level domain name is an identifier plus a region, also known as a top-level domain. For example, a second-level domain name is a subdomain name derived from a first-level domain name.

The difference between domain names and second-level domain names is that they have different compositions, different scopes, and different functions.

First, the composition is different.

1. Domain name: A domain name is the name of a computer or group of computers on the Internet composed 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, which belongs to the domain name separated from the main domain name.

Second, the scope is different.

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

Third, the role is different.

The main differences between them are as follows:

1. The definitions are different.

Top-level domains (or top-level domains), Changzhao English: top-leveldomains, first-leveldomains (TLDS), also translated as international top-level domains. It is the highest level of the Internet's DNS hierarchy;

Second-level domains (or second-level domain names; English: second-leveldomain; English abbreviation: SLD) is a domain in the Internet DNS hierarchy below the top-level domain.

The second-level domain name is the penultimate part of the domain name, for example, in a domain name, the second-level domain name is baidu.

2. The composition of domain names is different.

The first-level domain name is composed of a legal string + domain name suffix, for example: this form of domain name is the first-level domain name, and the old pai lisp is the subject of the domain namecom is a domain extension and can be: .net is also a domain extension;

A second-level domain name is a hostname below a first-level domain name, which is preceded by a string at the first level of the domain name, for example.