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A new type of web hosting based on the concept of partitions on mainframes and advanced resource scheduling to divide a computer into many virtually isolated servers. It is a server that runs inside another server. Hardware Node: The hardware that runs VPSs


A service that normally maps a computer-usable identifier of a host to a human-usable identifier for that host. e.g. maps to, which a computer can then connect to using TCP/IP


the unique name by which a network-attached device (which could consist of a computer, file server, network storage device, fax machine, copier, cable modem, etc.) is known on a network. It should generally be a third level domain


A domain is what we use to access websites on a daily basis, examples include,, If you purchased '' then you have basically purchased a subdomain of the 'com' domain.

Top level domain

The left most label in a domain name. (e.g. com, net, org)

IP Address

An IP address can be thought of as the equivalent of a street address or a phone number for a computer or other network device on the Internet. Just as each street address and phone number uniquely identifies a building or telephone, an IP address can uniquely identify a specific computer or other network device on a network. An IP address differs from other contact information, however, because the linkage of a user's IP address to his/her name is not publicly available information.

Really good site!


Apache is the most popular webserver. Apache is installed on all of our VPS products (


A mail transfer agent or MTA (also called a mail transport agent, message transfer agent, mail server, or a mail exchanger in the context of the Domain Name System) is a computer program or software agent that transfers electronic mail messages from one computer to another.


A mail transfer agent (MTA) used on Unix-like operating systems. It is freely available under the GNU GPL and it aims to be a general and flexible mailer with extensive facilities for checking incoming e-mail. Used on our cPanel VPS products.


A mail transfer agent that runs on Unix. It was written by Daniel J. Bernstein as a more secure replacement for the popular Sendmail program. Sendmail is installed on our Plesk VPS products.


A mail transfer agent (MTA) that is a well known project of the open source, free software and Unix communities, which is distributed both as free software and proprietary software. Sendmail is installed on our webmin VPS products.


Simple Mail Transfer Protocol (SMTP) is the de facto standard for e-mail transmissions across the Internet.


local e-mail clients (MUA) use the Post Office Protocol version 3 (POP3), an application-layer Internet standard protocol, to retrieve e-mail from a remote server over a TCP/IP connection. Nearly all subscribers to individual Internet service provider e-mail accounts access their e-mail with client software that uses POP3.


The Internet Message Access Protocol is an application layer Internet protocol that allows a local client to access e-mail on a remote server. E-mail clients using IMAP generally leave messages on the server until the user explicitly deletes them. This and other facets of IMAP operation allow multiple clients to access the same mailbox.


A communications protocol used to transfer or convey information on the World Wide Web. Its original purpose was to provide a way to publish and retrieve HTML hypertext pages.

This glossary is available under the terms of the GNU Free Documentation License.

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