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A computer is a machine that can be programmed to carry out sequences of arithmetic or logical operations automatically. -
The telegraph was a point-to-point text messaging system. -
The telephones is a telecommunication device that permits two or more people to have a consersation when they are too far to be heard directly. -
Radio is the technology of signaling and communicating using radio waves. -
The television is a telecommunication medium used for transmitting images, sound, color or dimention. -
The mobile phone is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area. -
A tablet computer, commonly shortened to tablet, is a mobile device, typically with a mobile operating system and touchscreen display processing circuitry.