A person who has signed up for something, like a class or event.
The registrant got a note about the event they signed up for.
註冊者收到了他們報名參加的活動的便條。
The owner of a domain name who has the right to use it.
The registrant must keep their domain name active by renewing it.
註冊者必須透過續期來保持他們的域名活躍。