Domain name

The hierarchical domain name system, organized into zones, each served by domain name servers.

String that identifies a realm of administrative autonomy, authority or control within the Internet.

- Domain name

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Domain name registrar

The Internet Messenger by Buky Schwartz, located in Holon, Israel

A domain name registrar is a company that manages the reservation of Internet domain names.


Reference to a web resource that specifies its location on a computer network and a mechanism for retrieving it.

The historic World Wide Web logo, designed by Robert Cailliau.

The format combines the pre-existing system of domain names (created in 1985) with file path syntax, where slashes are used to separate directory and filenames.


The website
The home page in 2015
Server-side programming language usage in 2016.

A website (also written as web site) is a collection of web pages and related content that is identified by a common domain name and published on at least one web server.

Uniform Resource Identifier

Unique sequence of characters that identifies a logical or physical resource used by web technologies.

URI syntax diagram

For example, the URL refers to a resource identified as , whose representation, in the form of HTML and related code, is obtainable via the Hypertext Transfer Protocol (http:) from a network host whose domain name is.


Method of exchanging messages ("mail") between people using electronic devices.

This screenshot shows the "Inbox" page of an email client; users can see new emails and take actions, such as reading, deleting, saving, or responding to these messages.
The at sign, a part of every SMTP email address
When a "robot" on Wikipedia makes changes to image files, the uploader receives an email about the changes made.
Email operation
The interface of an email client, Thunderbird.

2) The MSA determines the destination address provided in the SMTP protocol (not from the message header) — in this case, — which is a fully qualified domain address (FQDA). The part before the @ sign is the local part of the address, often the username of the recipient, and the part after the @ sign is a domain name. The MSA resolves a domain name to determine the fully qualified domain name of the mail server in the Domain Name System (DNS).


The domain name net is a generic top-level domain (gTLD) used in the Domain Name System of the Internet.

Top-level domain

org[.] is a node in the DNS tree, just like wikipedia.[org.] and en.[]. As such, it has its own DNS records

A top-level domain (TLD) is one of the domains at the highest level in the hierarchical Domain Name System of the Internet after the root domain.

Internet Assigned Numbers Authority

Standards organization that oversees global IP address allocation, autonomous system number allocation, root zone management in the Domain Name System (DNS), media types, and other Internet Protocol-related symbols and Internet numbers.

: IPv6 Prefix Assignment mechanism with IANA, RIRs, and ISPs.

In the case of the two major Internet namespaces, namely IP addresses and domain names, extra administrative policy and delegation to subordinate administrations is required because of the multi-layered distributed use of these resources.


Label that is assigned to a device connected to a computer network and that is used to identify the device in various forms of electronic communication, such as the World Wide Web.

Network Packet

In the latter form, a hostname is also called a domain name.

World Wide Web

World's dominant software platform.

The historic World Wide Web logo, designed by Robert Cailliau.
A web page displayed in a web browser
A global map of the Web Index for countries in 2014
This NeXT Computer was used by Sir Tim Berners-Lee at CERN and became the world's first Web server.
The World Wide Web functions as an application layer protocol that is run "on top of" (figuratively) the Internet, helping to make it more functional. The advent of the Mosaic web browser helped to make the web much more usable, to include the display of images and moving images (GIFs).
Graphic representation of a minute fraction of the WWW, demonstrating hyperlinks
A screenshot of a web page on Wikimedia Commons
Dynamic web page: example of server-side scripting (PHP and MySQL)
The website
The inside and front of a Dell PowerEdge web server, a computer designed for rack mounting
Multiple web servers may be used for a high traffic website; here, Dell servers are installed together to be used for the Wikimedia Foundation.
The results of a search for the term "lunar eclipse" in a web-based image search engine

Multiple web resources with a common theme and usually a common domain name make up a website.