What is a Domain Name? Plain-English explanation

Short definition: A domain name is the human-readable name of a website, such as info100.cc, that the Domain Name System translates into the numeric IP address the network needs in order to deliver the site.

Plain-English explanation

A domain name is the easy-to-remember part of a website address. People work with words, while the network underneath works with numbers, and the domain name is the bridge between the two. It typically has at least two parts, such as a name and an extension like .cc, and it is registered through registrars that coordinate with the global naming system. Once registered, the name can be pointed at a server so visitors reach the right site.

Why it matters

Domain names make the internet usable for people, and they are also part of a website's identity and brand. A clear, trustworthy name helps visitors recognize the site they intended to reach, while a misspelled look-alike name can lead people somewhere else entirely. That is why checking the address in the browser bar is one of the simplest safety habits on the web.

Concrete example

In the address https://info100.cc/articles, the domain name is info100.cc, while /articles is the path to a specific page on that site. The https part is the protocol that tells the browser how to make the connection secure.

Common confusion

People often say domain name when they actually mean the whole website address. The address also contains the protocol, such as https, and often a path, while the domain name is only the name itself. A domain name is also not the same as a website: the name is just the pointer, and the site itself lives on a server.

Related terms

DNS, IP Address, Server, Website Address

How people actually use it

People type domain names into browsers to visit websites, send email, or access other internet services. Organizations register and manage domain names to establish an online identity and direct traffic to their servers.

Related terms explained

DNS (Domain Name System)

The DNS is a hierarchical naming system that translates domain names into IP addresses. It acts as the internet's phone book, resolving queries from user devices to the correct server.

Example: When a user enters 'example.com', the DNS returns the IP address of the server hosting that site.

TLD (Top-Level Domain)

A TLD is the last segment of a domain name, such as .com, .org, or .net. TLDs are managed by designated registries and indicate the general purpose or geographic scope of the domain.

Example: In 'wikipedia.org', '.org' is the top-level domain.

Subdomain

A subdomain is a prefix to the main domain name, used to organize or separate different sections of a website. It is part of the full domain hierarchy and can point to different servers or directories.

Example: In 'blog.example.com', 'blog' is a subdomain of 'example.com'.

URL (Uniform Resource Locator)

A URL is the complete web address that specifies the protocol, domain, path, and sometimes query parameters to access a specific resource. It includes the domain name as part of its structure.

Example: https://example.com/page is a URL with the domain 'example.com'.

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More context

The first domain name ever registered was symbolics.com in 1985. Domain names are case-insensitive, but they are typically written in lowercase. The maximum length of a full domain name is 253 characters, and each label (part between dots) can be up to 63 characters.

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