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Telegraph
Is a machine used to transmit coded information using electrical signals -
Computer
Electronic machine capable of storing information and processing it automatically through mathematical and logical operations controlled by computer programs -
Radio
Is a mean of communication that is based on the sending of audio signals through waves -
Television
System of transmission of images at a distance, which are transformed into electromagnetic waves at the transmitter and are recovered in the receiving device -
Telephone
Communication system that transmits voice and sound over long distances by electrical or electromagnetic means. -
Mobile phone
Device that receives and transmits long-distance communications and is connected to a telephone network. -
Tablet
It is a mobile computing device in which the touch screen occupies almost its entire size and in which there is no physical keyboard. Larger in size than a mobile phone, tablets come in different sizes and for many they are a natural substitute for laptops, being lighter and easier to use.