At first glance, it might seem that the domain and the host are almost the same thing. However, upon closer examination, it becomes clear that this is not at all the case. Domain is the name of your site, which you come up with yourself and then buy, and the host is the physical location of your site on a specific server. This service is provided for a fee.
What is a host
Host (from the English host - "host, receiving guests") - any device that provides services on the "client-server" technology on any interfaces and is uniquely defined on this server. This is the place where various information is stored, for example, your site, because the term "host" is most often used in connection with the placement of a web resource on the Internet. More generally, a host is a local computer connected to the Internet. To designate a host, its network name is used - if the host is a home computer, and a domain or ip-address - if we are talking about a host on the Internet.
Many sites determine the uniqueness of visitors precisely by hosts, since each unique visitor to the resource corresponds to one host (that is, a local computer with Internet access). The concept of a host is related to such a concept as hosting. Hosting refers to a server that stores files that are always available to specific clients. The server that will host your resource may be located in another city and even in another country. Hosting services are provided by companies on a paid basis. Even a home computer can act as a host, provided that a special program, such as Apache, is installed on its hard disk. Let's say that several folders are planned to be located on the local server, each of which will be accessible only to a specific user, that is, each user will be able to access only his own folder. In addition, this hosting will definitely have a hoster - a person who has access to all folders and configures the server.
Why do I need a domain
Domain (from the English domain - "sphere", "territory") is the area of the space of hierarchical names identified by the domain. In other words, a domain means the address of the site, its name. The site name, or address, is then necessary to show visitors the way to the resource.
Each computer connected to the Internet has its own unique domain address, or in another way the domain name, or just the host name. An address, or domain, exists in the form of a word, sometimes numbers separated by periods. The number of dots in the name determines the level of the domain in front of us. The most common domains are the first (or top), second and third levels.
