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The functions of a computer typically include the following tasks: taking data, processing it, returning results, and storing it. To help computer systems perform these functions, computer devices can be classified as input devices, processing devices, output devices, and storage devices, respectively. -
A telegraph is a device for transmitting and receiving messages over long distances. Wireless telegraphy is transmission of messages over radio with telegraphic codes. -
A telephone converts sound, typically human voice, into electronic signals that is transmitted via cables and other communication channels to another telephone which reproduces the sound to the receiving user. -
The prime purpose of radio is to convey information from one place to another through the intervening media (i.e., air, space, nonconducting materials) without wires. -
TV, is a telecommunication medium for transmitting moving images and sound. The term can refer to a television set, or the medium of television transmission. Television is a mass medium for advertising, entertainment, news, and sports. -
Tablets let you do many of the same things as a traditional computer. They can browse the Internet, connect to social network apps, and display HD videos. They excel at applications that do not require a large amount of precise user input. Early tablet devices used light pens or a stylus as their input device. -
Originally only used for voice communication, today's mobile phones provide additional services such as e-mail, Internet browsing, PDA (Personal Digital Assistant) functionality, digital camera, SMS (Short Message Service) for text messaging, games, and the ability to watch video or listen to music.