Also known as “Electronic Mail”
A method of exchanging digital messages from an
author to one or more recipients
Today's email systems are based on a store-andforward model.
Consists of three components
A web application which allows people to add,
modify, or delete content in collaboration with
Invites all users to edit any page or to create new
pages within the wiki Web site
Is not a carefully crafted site for casual visitors
It seeks to involve the visitor in an on going process
of creation and collaboration that constantly changes
the Web site landscape
Enables communities to write documents
collaboratively, using a simple mark up language and
a web browser.
A centralized online service which enables users to add,
annotate, edit, and share bookmarks of web documents
Delicious, founded in 2003, popularized the terms "social
bookmarking" and "tagging“
Tagging is a significant feature of social bookmarking
systems, enabling users to organize their bookmarks in
flexible ways and develop shared vocabularies known
Unlike file sharing, social bookmarking does not save
the resources themselves, merely bookmarks
that reference them, i.e. a link to the bookmarked page
Also known as HyperText Markup Language
The main markup language for creating web pages and other information that can be displayed in a web browser
Written in the form of HTML elements consisting of tags enclosed in angle brackets (like <html>), within the web page content
HTML(HyperText Markup Language)
Internet media type
Uniform Type Identifier
World Wide Web
Type of format
Also known as netcast
A digital medium consisting of an episodic series
of audio, video, PDF, or ePub files subscribed to
and downloaded through web syndication or
streamed online to a computer or mobile device
"podcasting" was first mentioned by Ben
Hammersley in The Guardian newspaper in a
February 2004 article, along with other proposed
names for the new medium.
It is a portmanteau of the words "pod" —from iPod—
a methodology and group of technologies for the
delivery of voice
communications and multimedia sessions
over Internet Protocol (IP) networks, such as the
Internet. Other terms commonly associated with
VoIP are IP telephony, Internet telephony, voice
over broadband (VoBB), broadband telephony, IP
communications, and broadband phone service.
may refer to any kind of communication over the Internet that offers
a real-time transmission of text messages from sender to receiver
may address point-to-point communications as well
as multicast communications from one sender to many receivers and
voice and video chat, or may be a feature of a web conferencing service
The first online chat system was called Talkomatic, created by Doug
Brown and David R. Woolley in 1974 on the PLATO System at
the University of Illinois.
The first dedicated online chat service that was widely available to the
public was the CompuServe CB Simulator in 1980, created
by CompuServe executive Alexander "Sandy" Trevor in Columbus, Ohio.
(abbreviated as WWW or W3, commonly known as the web)
A system of interlinked hypertext documents accessed via the Internet.
With a web browser, one can view web pages that may contain text,
images, videos, and other multimedia and navigate between them
Had a number of differences from other hypertext systems available at
the time. The web required only unidirectional links rather than
bidirectional ones, making it possible for someone to link to another
resource without action by the owner of that resource
It also significantly reduced the difficulty of implementing web servers
and browsers (in comparison to earlier systems), but in turn presented
the chronic problem of link rot
Streaming media is multimedia that is constantly received by and presented to an enduser while being delivered by a provider. Its verb form, "to stream", refers to the process
of delivering media in this manner; the term refers to the delivery method of the
medium rather than the medium itself.
In the early 1920s, George O. Squier was granted patents for a system for the
transmission and distribution of signals over electrical lines which was the technical basis
for what later became Muzak, a technology streaming continuous music to commercial
customers without the use of radio.
From the late 1980s through the 1990s, consumer-grade personal computers became
powerful enough to display various media. The primary technical issues related to
having enough CPU power and bus bandwidth to support the required data rates
creating low-latency interrupt paths in the operating system to prevent buffer
However, computer networks were still limited, and media were usually delivered over
non-streaming channels, such as by downloading a digital file from a remote server and
then saving it to a local drive on the end user's computer or storing it as a digital file
and playing it back from CD-ROMs.
(a truncation of the expression web log) is a discussion or
informational site published on the World Wide Web and
consisting of discrete entries ("posts") typically displayed in
reverse chronological order (the most recent post appears first).
The term "weblog" was coined by Jorn Barger on 17 December
1997. The short form, "blog", was coined by Peter Merholz, who
jokingly broke the word weblog into the phrase we blog in the
sidebar of his blog Peterme.com in April or May 1999. Shortly
thereafter, Evan Williams at Pyra Labs used "blog" as both a
noun and verb ("to blog", meaning "to edit one's weblog or to
post to one's weblog") and devised the term "blogger" in
connection with Pyra Labs' Blogger product, leading to the
popularization of the terms.
A platform to build social networks or social relations among
people who, for example, share interests, activities, backgrounds,
or real-life connections. A social network service consists of a
representation of each user (often a profile), his social links, and
a variety of additional services. Most social network services
are web-based and provide means for users to interact over
the Internet, such as e-mail and instant messaging. Online
community services are sometimes considered as a social
network service, though in a broader sense, social network
service usually means an individual-centered service
whereas online community services are group-centered. Social
networking sites allow users to share ideas, pictures, posts,
activities, events, and interests with people in their network.
uniform resource locator, abbreviated URL (also known as web address, particularly
when used with HTTP)
a specific character string that constitutes a reference to a resource. In most web
browsers, the URL of a web page is displayed on top inside an address bar.
The Uniform Resource Locator was standardized in 1994 by Tim Berners-Lee and the
URI working group of the Internet Engineering Task Force (IETF) as an outcome of
collaboration started at the IETF Living Documents "Birds of a Feather" session in 1992
(or news feed) is a data format used for providing users with frequently updated
content. Content distributors syndicate a web feed, thereby allowing users
to subscribe to it. Making a collection of web feeds accessible in one spot is known
as aggregation, which is performed by an aggregator. A web feed is also sometimes
referred to as a syndicated feed.
Confusion between Web feed and RSS
The term RSS is often used to refer to web feeds or web syndication in general,
although not all feed formats are RSS. The Blogspace description of using web feeds in
an aggregator, for example, is headlined "RSS info" and "RSS readers" even though its
first sentence makes clear the inclusion of the Atom format: "RSS and Atom files
provide news updates from a website in a simple form for your computer."