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The Telegraph
the telegraph is a system for transmitting messages from a distance along a wire, especially one creating signals by breaking and making an electrical connection. -
Braille
a system of printing for the blind in which the letters are represented by raised dots. -
The First Phone
a system for transmitting voices over a distance using wire or radio, by converting acoustic vibrations to electrical signals. -
Visible Light Communication
Visible light communication (VLC) is a data communications variant which uses visible light between 400 and 800 THz (780–375 nm). ... Using visible light is also less dangerous for high-power applications because humans can perceive it and act to protect their eyes from damage. -
The Radio
the transmission and reception of electromagnetic waves of radio frequency, especially and most commonly those carrying sound messages. -
The First Computer
an electronic device which is capable of receiving information in a particular form and of performing a sequence of operations in accordance with a predetermined but variable set of procedural instructions to produce a result in the form of information or signals. -
E Mail
messages distributed by electronic means from one computer user to one or more recipients via a network. -
The Internet
a global computer network providing a variety of information and communication, consisting of interconnected networks using communication protocols that have been simplified by a computer or phone -
Wifi
a facility allowing computers, smartphones, or other devices to connect to the Internet or communicate with one another wirelessly within a particular area. -
The Deep Web
the part of the World Wide Web that is not discoverable by means of standard search engines, including password-protected or dynamic pages and encrypted networks. it's primarily used for illegal activity such a selling and buying drugs, weapons and people.
