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The telegraph is a device used to communicate at a long distance -
The telephone is a telecommunication device created to transmit acoustic signals. -
Radio is the technology of signaling and communicating using radio waves -
is a telecommunication medium used for transmitting moving images in color, and in two or three dimensions and sound -
A computer is a machine that can be programmed to carry out sequences of arithmetic or logical operations automatically. -
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 -
The tablet is a mobile device, typically with a mobile operating system and touchscreen display processing circuitry, and a rechargeable battery in a single, thin and flat package