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D

Glossary of Internet Terms and Phrases

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Data

Numbers, characters, images, or other method of recording, in a form which can be assessed by a human or (especially) input into a computer, stored and processed there, or transmitted on some digital channel. Computers nearly always represent data in binary.

Data on its own has no meaning, only when interpreted by some kind of data processing system does it take on meaning and become information.

People or computers can find patterns in data to perceive information, and information can be used to enhance knowledge. Since knowledge is prerequisite to wisdom, we always want more data and information. But, as modern societies verge on information overload, we especially need better ways to find patterns.

Source: Dictionary.com

Database Management System (DBMS)

A software system that facilitates the creation and maintenance and use of an electronic database.

Source: Dictionary.com

Database

One or more large structured sets of persistent data, usually associated with software to update and query the data. A simple database might be a single file containing many records, each of which contains the same set of fields where each field is a certain fixed width.

A database is one component of a database management system.

Source: Dictionary.com

Dial Up

A temporary, as opposed to dedicated, connection between machines established over a telephone line using modems.

Source: Dictionary.com

 

Digital Asset Management

A system that creates a centralized repository for digital files that allows the content to be archived, searched and retrieved. The digital content is stored in databases called asset repositories while metada such as photo captions, article key words, advertiser names, contact names, file names or low-resolution thumbnail images are stored in separate databases called media catalogs and point to the original items. Digital asset management also is known as enterprise digital asset management, media asset management or digital asset warehousing.

Source: IntranetJournal.com

Digital Certificate

A digital certificate is an electronic "credit card" that establishes your credentials when doing business or other transactions on the Web. It is issued by a certification authority (CA). It contains your name, a serial number, expiration dates, a copy of the certificate holder's public key (used for encrypting messages and digital signatures), and the digital signature of the certificate-issuing authority so that a recipient can verify that the certificate is real. Some digital certificates conform to a standard, X.509. Digital certificates can be kept in registries so that authenticating users can look up other users' public keys.

Source: Whatis.com

Digital Rights Management

A system for protecting the copyrights of data circulated via the Internet by enabling secure distribution and/or disabling illegal distribution of the data. Typically, a DRM system protects intellectual property by either encrypting the data so that it can only be accessed by authorized users or marking the content with a digital watermark or similar method so that the content can not be freely distributed.

Source: IntranetJournal.com

DNS (Domain Name System)

A general-purpose distributed, replicated, data query service chiefly used on Internet for translating hostnames into Internet addresses. Also, the style of hostname used on the Internet, though such a name is properly called a fully qualified domain name. DNS can be configured to use a sequence of name servers, based on the domains in the name being looked for, until a match is found.

The name resolution client (e.g. Unix's gethostbyname() library function) can be configured to search for host information in the following order: first in the local /etc/hosts file, second in NIS and third in DNS. This sequencing of Naming Services is sometimes called "name service switching". Under Solaris is configured in the file /etc/nsswitch.conf.

DNS can be queried interactively using the command nslookup. It is defined in STD 13, RFC 1034, RFC 1035, RFC 1591.

BIND is a common DNS server.

Source: Dictionary.com

Document Management

Traditionally, document management is a term used to manage internal documents and making the them easier to share within an organization. It differs from traditional Web content because the content is not published on the Web for all to see.

Source: IntranetJournal.com

See also: Content Management

Domain Name

A series of alphanumeric strings separated by periods, such as www.hmco.com, that is an address of a computer network connection and that identifies the owner of the address.

Source: Dictionary.com

Doorway Pages

A webpage designed to rank well on a specific search engine for a specific keyword phrase. These pages usually rely on frequent repetition of the keyword phrase, and often try to "trick" search engines into ranking them well.

Downloading

To transfer (data or programs) from a server or host computer to one's own computer or device.

Source: Dictionary.com

DSL (Digital Subscriber Line)

A family of digital telecommunications protocols designed to allow high speed data communication over the existing copper telephone lines between end-users and telephone companies.

When two conventional modems are connected through the telephone system (PSTN), it treats the communication the same as voice conversations. This has the advantage that there is no investment required from the telephone company (telco) but the disadvantage is that the bandwidth available for the communication is the same as that available for voice conversations, usually 64 kb/s (DS0) at most. The twisted-pair copper cables into individual homes or offices can usually carry significantly more than 64 kb/s but the telco needs to handle the signal as digital rather than analog.

There are many implementation of the basic scheme, differing in the communication protocol used and providing varying service levels. The throughput of the communication can be anything from about 128 kb/s to over 8 Mb/s, the communication can be either symmetric or asymmetric (i.e. the available bandwidth may or may not be the same upstream and downstream). Equipment prices and service fees also vary considerably.

The first technology based on DSL was ISDN, although ISDN is not often recognized as such nowadays. Since then a large number of other protocols have been developed, collectively referred to as xDSL, including HDSL, SDSL, ADSL, and VDSL. As yet none of these have reached very wide deployment but wider deployment is expected for 1998-1999.

Source: Dictionary.com

DSL (Digital Subscriber Line)

A family of digital telecommunications protocols designed to allow high speed data communication over the existing copper telephone lines between end-users and telephone companies.

When two conventional modems are connected through the telephone system (PSTN), it treats the communication the same as voice conversations. This has the advantage that there is no investment required from the telephone company (telco) but the disadvantage is that the bandwidth available for the communication is the same as that available for voice conversations, usually 64 kb/s (DS0) at most. The twisted-pair copper cables into individual homes or offices can usually carry significantly more than 64 kb/s but the telco needs to handle the signal as digital rather than analog.

There are many implementation of the basic scheme, differing in the communication protocol used and providing varying service levels. The throughput of the communication can be anything from about 128 kb/s to over 8 Mb/s, the communication can be either symmetric or asymmetric (i.e. the available bandwidth may or may not be the same upstream and downstream). Equipment prices and service fees also vary considerably.

The first technology based on DSL was ISDN, although ISDN is not often recognized as such nowadays. Since then a large number of other protocols have been developed, collectively referred to as xDSL, including HDSL, SDSL, ADSL, and VDSL. As yet none of these have reached very wide deployment but wider deployment is expected for 1998-1999.

Source: Dictionary.com

Dynamic HTML (DHTML)

An extension of HTML giving greater control over the layout of page elements and the ability to have web pages which change and interact with the user without having to communicate with the server.

DHTML was created by Microsoft can be viewed in Internet Explorer 4.0 and Netscape Communicator 4.0 but, as usual, Microsoft and Netscape disagree on how DHTML should be implemented. The Document Object Model Group of the World Wide Web Consortium is developing standards for DHTML.

Source: Dictionary.com

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Last modified: Monday March 21, 2011 12:18 PM