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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 is an apparatus or device that uses electrical signals to transmit coded text messages, such as Morse code, over cable lines or radio communications. -
A telephone is a telecomunications device that permits two or more users to conduct a conversation when they are too far to be heard directly. -
Radio is a means of communication that is based on sending audio signals through radio waves. -
Is a telecommunication medium used for transmitting moving images in monochrome (black and white), or in color, and in two or three dimensions and sound. -
The tablet is a portable electronic device larger than a smartphone, it is a single piece that integrates a touch screen that emits light and with which it interacts primarily with the fingers or a stylus, without the need for a physical keyboard or mouse . -
A mobile phone, cellular phone, or just 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.