Domain (domain name/domain name) is a readable textual logical identifier used to define a resource on the Internet, such as a website, email, or other services. Domains are used to replace numeric IP addresses that actually point to specific servers on the Internet.
If it's simpler, it's the name of the site (site address) that the user writes to the browser's address board. The domain name of this site is tseivo.com
Доменне ім'я в адресному рядку браузера
The domain consists of two main parts: the second level (Second-Level Domain, SLD) and the top level (Top-Level Domain, TLD). For example, in the "tseivo.com" domain, "tseivo" is the second level, and "com" is the upper level.
Domains are used so that people can easily remember and access resources on the Internet using a text identifier instead of a numeric IP address. Domain registration is carried out through domain registrars, who receive permission to use a specific domain for a certain period of time.