There are many forms of communication which help us keep in touch with what's happening in the world.
Moreover, communication can act as a channel to exchange ideas or express our thoughts and feelings.
In earlier times, some Indian and African tribes beat a drum to different rhythms to warn others of danger. In the 1820s Samuel Morse sent electric signals over long distances. Later, he invented a code that used dots and dashes to represent the letters of the alphabet. This code was used to send messages through a series of signals along wires connected to a buzzer.
Alexander Graham Bell made things easier by inventing the telephone in 1876. Then the Lumiere brothers discovered 'moving pictures' in 1895, which led to silent movies - a whole new medium of entertainment.
Television was invented by John Logie Baird in 1922.
One of the most common forms of visual communication is writing. There is also sign language for the deaf and Braille for the blind. There may be many signs you are not aware of. There are those which direct traffic. Other commonly observed signs help locate places and warn people of danger.
Electronic transmission is the latest form of communication. We use e-mail, voice-mail and the Internet to exchange information.
In the future, we may have electronic newspapers and books, and perhaps a 'spacenet' linking Earth with other planets.
If all our communication systems fail, we can still rely on pigeons to carry our messages! Brian is a student of Kowloon Junior School