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A computer is an electronic system used to store and process data. The computer takes data from the outside (through the input units), stores in its memory, processes it and sends it to the operator (through the output units). -
The telegraph is an apparatus or device that uses electrical signals for the transmission of coded text messages, such as Morse code, through wire lines or radio communications. -
The telephone is a telecommunication device, created to transmit acoustic signals at a distance by means of electrical signals. -
The radio is a device of communication that is based on the sending of audio signals through radio waves, although the term is also used for other forms of remote audio transmission such as Internet radio. -
Television is a device for the transmission and reception of images and sounds at a distance that simulate movements, which uses a diffusion mechanism. -
It is a mobile computing device in which the touch screen occupies almost its entire size and in which there is no physical keyboard. -
It is a device that have essential functions such as the possibility of calling or sending text messages, and in some devices the use of multimedia files or surfing the internet using GMS or Wi-Fi connections.