CommunicationCommunication is the process whereone person is expressing his or her idea& the other one is listening to the ideabeing expressed by the one who istalking. That is how you definecommunication.When this results to have anunderstanding to both of them, thereforethere is already a communication.
Visual CommunicationVisual communication as the namesuggests is communication throughvisual aid & is described as theconveyance of ideas & information informs that can be read or looked upon.
The smoke signal It is one of the oldest forms of long-distance communication. It is a form of visual communication used over long distance. In Ancient China, soldiers stationed along the Great Wall would alert each other of impending enemy attack by signalling from tower to tower. In this way, they were able to transmit a message as far away as 750 km(470 mi) in just a few hours.
Pigeon Post It is the use of homing pigeons to carry messages. Pigeons were effective as messengers due to their natural homing abilities. The pigeons were transported to a destination in cages, where they would be attached with messages, then naturally the pigeon would fly back to its home where the owner could read his mail. Pigeons have been used to great effect in military situations.
Mail Mail, or post, is a system for transporting letters & other tangible objects: written documents, typically enclosed in envelopes, & also small packages are delivered to destinations around the world. Anything sent through the postal system is called mail or post. A postal service can be private or public, though many governments place restrictions on private systems. Since the mid-19th century national postal systems have generally been established as government monopolies with a fee on the article prepaid.
Heliograph It is a wireless solar telegraph that signals by flashes of sunlight (generally using Morse code) reflected by a mirror. The flashes are produced by momentarily pivoting the mirror, or by interrupting the beam with a shutter. The heliograph was a simple but effective instrument for instantaneous optical communication over long distances during the late 19th & early 20th century.
Maritime flag It is a flag designated for use on ships, boats, & other watercraft. Naval flags are considered important at sea & the rules & regulations for the flying of flags are strictly enforced. The flag flown is related to the country of registration: so much so that the word "flag” is often used symbolically as a synonym for "country of registration".
Signal lamp It is a visual signalling device for optical communication (typically using Morse code). Modern signal lamps are a focused lamp which can produce a pulse of light. In large versions this pulse is achieved by opening & closing shutters mounted in front of the lamp.
Newspaper(Print Media) A newspaper is a scheduled publication containing news of current events, informative articles, diverse features, editorials, & advertising Johannes Gutenbergs work on the printing press began in approximately 1436. The invention of printing press led to an entire new era of mass communication. Newspapers, magazines, periodicals etc. This techinique of mass communication diversified with technology & is still the most used medium of mass communication. By 2007, there were 6,580 daily newspapers in the
Oral CommunicationOral communication, while primarilyreferring to spoken verbal communication,can also employ visual aids & non-verbal elements to support the conveyanceof meaning.Oral communication includes speeches,presentations, discussions, & aspects ofinterpersonal communication.
Horn & Drums A horn is a tapered sound guide designed to provide an acoustic impedance match between a sound source & free air. This has the effect of maximizing the efficiency with which sound waves from the particular source are transferred to the air. Conversely, a horn can be used at the receiving end to optimize the transfer of sound from the air to a receiver.
Electrical telegraph It is a telegraph that uses electrical signals, usually conveyed via telecommunication lines or radio. The electromagnetic telegraph is a device for human-to- human transmission of coded text messages. It is the first form of electrical telecommunications. Later electrical telegraph networks permitted people & commerce to almost instantly transmit messages across both continents & oceans.
Telephone The telephone, colloquially referred to as a phone, is a telecommunications device that transmits & receives sounds, usually the human voice. They are a point-to-point communication system to allow two people separated by large distances to talk to each other. Developed in the mid-1870s by Alexander Graham Bell. The telephone has long been considered indispensable to businesses, households & is now one of the most common appliances in the developed world.
Photophone The photophone (also known as a radiophone) is a telecommunications device which allowed for the transmission of both articulated sounds & normal human conversations on a beam of light. The device was a precursor to fibre-optic communications that came into widespread use during the 1980s.
Radio Radio is the transmission of signals through free space by electromagnetic waves with frequencies significantly below visible light, in the radio frequency range, from about 3 kHz to 300 GHz. These waves are called radio waves. Electromagnetic radiation travels by means of oscillating electromagnetic fields that pass through the air & the vacuum of space.
Television Television: (TV) is a telecommunication medium for transmitting & receiving moving images that can be monochrome (black-and-white) or coloured, with or without accompanying sound. Commercially available since the late 1920s, the television set has become commonplace in homes, businesses & institutions, particularly as a vehicle for advertising, a source of entertainment & news.
Videophone Videophone is a telephone with a video display, capable of simultaneous video & audio for communication between people in real-time. It provided the first form of video telephony, later to be followed by videoconferencing, webcams & finally HD telepresence. Modern examples of videophones Skpye (Microsoft), Facetime (Apple) etc.
Computer Network It is a collection of computers & other hardware components interconnected by communication channels that allow sharing of resources & information. Networks may be classified according to a wide variety of characteristics, such as the medium used to transport the data, communications protocol used, scale, topology & scope.
Intranet Intranet is a computer network that uses Internet Protocol technology to share information, operational systems, or computing services within an organization. The term is used in contrast to internet, a network between organizations & instead refers to a network within an organization. The objective is to organise each individuals desktop with: minimal cost, time & effort to be more productive, cost efficient, timely, & competitive.
Mobile Phones A device that can make & receive telephone calls over a radio link moving around a wide geographic area. It does so by connecting to a cellular network provided by a mobile phone operator, allowing access to the public telephone network. The first hand-held mobile phone was demonstrated by Dr Martin Cooper of Motorola in 1973 In 1983, the DynaTAC 8000x was the first to be commercially available. From 1990 to 2011, worldwide mobile phone subscriptions grew from 12.4 million to over 5.6
• 1st Generation of wireless telephone. • They used Analog telecommunications standards introduced in the1G 1980s until replaced by 2G. • Benefits of 2G networks over their predecessors were that phone conversations were digitally encrypted; 2G systems were significantly more efficient and 2G introduced data services for2G mobile, starting with SMS text messages • It introduced Mobile TV, Video on demand, Video Conferencing, Telemedicine, Location-based services, Global Positioning System3G (GPS) • 4G system provides mobile ultra-broadband Internet access. • Conceivable applications include amended mobile web access, IP4G telephony, gaming services, HD/3D Mobile TV & video conferencing.
Satphone Satellite telephone: satellite phone, or satphone is a type of mobile phone that connects to orbiting satellites instead of terrestrial cell sites. They provide similar functionality to terrestrial mobile telephones; voice, short messaging service & low- bandwidth internet access are supported through most systems.
Fax Fax is the telephonic transmission of scanned printed material (both text & images), normally to a telephone number connected to a printer or other output device. The original document is scanned with a fax machine (, which processes the contents as a single fixed graphic image, converting it into a bitmap, & then transmitting it through the telephone system. The receiving fax machine reconverts the coded image & prints a copy.
Internet The Internet is a global system of interconnected computer networks that use the standard Internet protocol suite to serve billions of users worldwide. It is a network of networks that consists of millions of private, public, academic, business, & government networks, of local to global scope, that are linked by a broad array of electronic, wireless & optical networking technologies. The Internet carries an extensive range of information resources & services, such as the inter- linked hypertext documents of the World Wide Web (WWW) & the infrastructure to support email.
E-Mail Electronic mail: also known as email or e-mail, is a method of exchanging digital messages from an author to one or more recipients. Modern email operates across the Internet or other computer networks. Some early email systems required that the author & the recipient both be online at the same time. Todays email systems are based on a store-and- forward model.
Social Networking A social networking service is an online service, platform, or site that focuses on facilitating the building of social networks or social relations among people who, e.g. share interests, activities, backgrounds or real-life connections. A social network service consists of a representation of each user (often a profile), his/her social links, & a variety of additional services. Most social network services are web-based & provide means for users to interact over the Internet, such as email & IM. Example: Facebook(800 million active users), Twitter , Google+ etc.