This document discusses various forms of communication including verbal, non-verbal, written, and visual communication. It then describes different means of communication throughout history such as postal services, telegraphy, telegrams, telephones, radio, television, fax, pagers, email, and the internet. Communication allows the transfer of information from one place to another through both physical and electronic transmission of messages.

1. COMMUNICATION

2.  Communication is simply the act of transferring
information from one place to another.
 Communication is sending and receiving of spoken
or written messages between people and places.

3. The different categories of
communication include:
 Spoken or Verbal communication: face-to-face,
telephone, radio or television and other media.
 Non- Verbal communication: body language,
gestures, how we dress or act - even our scent.
 Written Communication: letters, e-mails, books,
magazines, the Internet or via other media.
 Visualizations: graphs and charts, maps, logos and
other visualizations can communicate messages.

4. Means of communication
Post
 In India, postal service were started by British
government since 1837.
 After independent post and telegraph department
of India started providing postal services.
 Code Number.

5. Telegraph
 Telegraphy is the long-distance transmission of
textual or symbolic messages without the physical
exchange of an object bearing the message.
 Telegraphy requires that the method used for
encoding the message be known to both sender and
receiver. Such methods are designed according to the
limits of the signalling medium used.

6. Telegram
 A telegram is a written message transmitted by
using an electric device. The message was carried
along wires, and the text written or printed and
delivered by hand or teleprinter.
 Telegrams were very widely used, because private
telephones were not usual. Nowadays they are not
useful because most people have
private telephones and the use of e-mail. The idea
was developed by the British post office as a
service for urgent letters.

7. Telephone
 A telephone, is a telecommunications device
that permits two or more users to conduct a
conversation when they are too far apart to be
heard directly. A telephone converts sound,
typically and most efficiently the human voice,
into electronic signals suitable
for transmission via cables or other transmission
media over long distances, and replays such
signals simultaneously in audible form to its user.

8.  In 1876, Scottish emigrant Alexander Graham
Bell was the first to be granted a United States
patent for a device that produced clearly
intelligible replication of the human voice.

9. Radio
 Radio is the technology of using radio waves to
carry information, such as sound, by
systematically modulating properties of
electromagnetic energy waves transmitted through
space, such as their amplitude, frequency, phase
or pulse width. When radio waves strike
an electrical conductor, the oscillating fields
induce an alternating current in the conductor. The
information in the waves can be extracted and
transformed back into its original form.

10. Television
 Television or TV is a telecommunication medium used for
transmitting moving images in monochrome (black-and-white), or
in color, and in two or three dimensions and sound. It can refer to
a television set, a television program ("TV show"), or the medium
of television transmission. Television is a mass medium,
for entertainment, education, news, and advertising.

11. Fax
 Fax (short for facsimile), sometimes
called telecopying or telefax (the latter
short for telefacsimile), is the telephonic
transmission of scanned printed material
(both text and images), normally to a
telephone number connected to a printer or
other output device. The original document
is scanned with a fax machine (or
a telecopier).

12. pager
 A pager (also known as a beeper) is a
wireless telecommunications device that receives
and displays numeric messages and/or receives and
announces voice messages. One-way pagers can
only receive messages, while response
pagers and two-way pagers can also acknowledge,
reply to, and originate messages using an internal
transmitter. Pagers operate as part of a paging
system which includes one or more fixed
transmitters (or in the case of response pagers and
two-way pagers, one or more base stations), as
well as a number of pagers carried by mobile users.

13. Electronic mail
 Electronic mail, or email, is a method of exchanging digital
messages between people using digital devices such as computers,
tablets and mobile phones. Email first entered substantial use in
the 1960s and by the mid-1970s had taken the form now
recognized as email. Email operates across computer networks,
which in the 2010s is primarily the Internet. Some early email
systems required the author and the recipient to both be online at
the same time, in common with instant messaging. Today's email
systems are based on a model.

14. Internet
 The Internet is the global system of
interconnected computer networks that use the Internet protocol
suite (TCP/IP) to link devices worldwide. It is a network of
networks that consists of private, public, academic, business, and
government networks of local to global scope, linked by a broad array
of electronic, wireless, and optical networking technologies.