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The telegraph, a device that uses electrical signals to transmit messages, was the first means of high-speed, long-distance communication. One of the most revolutionary inventions of the 19th century, it was invented by Samuel F.B. Morse, the creator of Morse code in 1837. -
A telephone is a device that allows remote transmission of sounds using electrical signals. It was invented in 1871 by Antonio Meucci, although the first to patent it was Alexander Graham Bell, in 1876. -
Television is a system for the transmission and reception of images and sounds at a distance that simulate movements, which uses a diffusion mechanism. -
A computer is a computing device that is capable of receiving, storing, and processing information in a useful way. A computer is programmed to perform logical or arithmetic operations automatically. -
Tablets work in a similar way to a computer, although they are usually focused to be used more for content reading and web browsing than for professional uses. -
A mobile phone is a phone that can make and receive phone calls over a radio link while moving around a wide geographic area. It does this by connecting to a cellular network provided by a mobile operator, which allows access to the public telephone network. -
Radio is a means of communication that is based on sending audio signals through radio waves, although the term is also used for other forms of remote audio delivery such as Internet radio.