Domain name (English: Domain Name), referred to as domain name or network domain, is the name of a computer or computer group on the Internet consisting of a string of names separated by dots. It is used for data transmission. Identifies the electronic location (sometimes also geographical location) of a computer. As a distributed database that can map domain names and IP addresses to each other, it allows people to access the Internet more conveniently without having to remember a string of IP addresses that can be directly read by machines.

The domain name is the most important virtual asset of a website, and its role is equivalent to the house number in real life. Registering a domain name has the following three main purposes:

1. Build a website. The most common use of registering a domain name is to build a website, which can be used directly to access the website. A good domain name can make the website more effortless in the promotion process and make it easier for users to remember.

2. Make money by investing. In addition to making websites, there are many people who register domain names for investment, and there are also many people who specialize in domain name investments, called "Mi farmers." Because one domain name registration means one less domain name, a good domain name has room for appreciation.

3. Brand protection. Currently, there are many suffixes for domain names, but most websites will only use one main domain name for use and promotion. Companies that value their own brands usually register and protect other important domain name suffixes other than com to avoid unnecessary losses caused by others registering them.