Top-level domain name and second-level domain name are the foundation and core of Internet domain name system. By understanding these concepts, we can better understand and use the domain name system on the Internet and make our online life more convenient and efficient.

first class domain name

The top-level domain name is the rightmost part of the website, such as ". Com ",which is the foundation and core of the website. Its function is to identify the category and nature of websites, such as business, education and government.

second-level domain

The second-level domain name is the domain name attached to the main domain name, such as "www.fuyeor.com", which is the domain name below the main domain name. Its function is to help users better remember and visit websites. For example, "www" stands for World Wide Web, which is the most commonly used second-level domain name.

domain name system

Domain name system is one of the basic facilities of the Internet, which realizes the access of websites on the Internet by mapping domain names and IP addresses. The hierarchical structure of domain name system includes root domain name, top-level domain name and second-level domain name, which provides important support for the development of Internet.