-
A computer is a machine that stores and automates information through computer programs specifically designed for this task.
-
The telegraph is an electrical device capable of transmitting text messages. To do this, it uses coding, by means of Morse code, in electrically emitted signals.
-
Device that transmitted sounds through a cable through electrical signals.
-
Radio is the signaling and communication technology using radio waves. Radio waves are electromagnetic waves with a frequency between 30 hertz and 300 gigahertz.
-
Television is a system for transmitting images and sound at a distance through Hertzian waves.
-
Tablets use a touch sensitive screen so you can type and navigate quickly. They are characterized by being very light and are cheaper than a computer.
-
A mobile phone or cell phone is a portable device that can make or receive calls through a radio frequency carrier, while the user is moving within a telephone service area.