The  way of communicating through various flag positions is called:

With time, letters and symbols were developed, which made up the:

To send an email, we require:

Copies of printed materials can be send  around the world in seconds through:

Which is the quickest way to  sent and receive messages?

The Telex was invented in:

The telephone was invented by:

The activity of conveying information through the exchange of thoughts, messages, or information is called:

 A mobile phone is a:

We talk to people in far off cities using: