The main theme of the above matter is to make a small presentation to show how the communication has changed in the past 10 Decades.

There has been a drastic improvement in the field of Communication. The way the message has transferred from one place to other raises, a doubt in every one whether the globe has gone small.

The answer to the above question is logically "Yes” but physically "No”.

To communicate with one another at considerable distance, people once had to rely on letters carried by land and sea. With the tremendous increase in trade and travel during the Industrial revolution, businessmen and others needed to know more quickly what was happening, both at home and abroad. By the mid-nineteenth century, new discoveries and inventions in Electricity and Electronics made this faster communication possible

What is the main Idea behind transferring the signals at a faster rate?

The discovery of Electromagnetic waves lead to this faster communication. In 1820, Danish physics professor Oesterd realized that the electric current was producing magnetism, which when he passed a strong electric current through a wire, a nearby compass needle deflected.

The main idea behind fast data transfer rate is that the speed of the EM waves is equal to the speed of the light i.e., 3*10exp 8m/sec and the speed of the sound signal is 331m/sec. Therefore, the transmission speed of light is more than that of sound hence the signals modulated into EM waves and transmitted using Antennas. At the receiving ends also antennas are used where the received EM signals are converted back into the original previous signals (as they were before modulation).

The process of converting a low frequency signal into a high frequency signal called as Modulation.

There has been different modulation techniques used namely,

1) Frequency modulation 2) Amplitude modulation 3) Pulse code modulation

Today the main means of communication are,

1) Radio 2) Telephone 3) Television 4) Internet

Radio: The German Physicist Heinrich Hertz was the first to produce and detect radio waves. Today the radio wave propagation uses Amplitude modulation for long distance transmission and Frequency modulation for short distance transmission.

Telephone: In 1876, Alexander Graham Bell invented the telephone. He invented a form of electric telegraph that sent signals as musical notes made by vibrating needs. This idea led to devise a new way of sending and receiving frequencies present in the human voice. The result was Telephone.

Television: In 1926, John Logie Baird demonstrated the first television system. He used a rotating disc with holes in it to transform light from a scene into lines. A photo electric cell changed brightness variations into electric signals. In Baird's receiver, the signals made a bulb vary in brightness. The viewer saw a faint, fuzzy image through holes in another spinning disc. The system was soon replaced by a higher quality fully electronic system.

Internet: The world has gone small with the use of Internet, where the different networks connected together. The different networks connected together with the help of a physical device called ROUTER. The evolution of various communication protocols made this transfer of data reliable and more efficient possible.

Mostly used Protocol is TCP/IP (transmission control protocol/Internet protocol).

The different topologies used in the internet are,

1) LAN 2) WAN 3) MAN

Mostly, we use Wide Area Network (WAN) topology.

Various improvements are taking place in today's communication making them to create new revolutions in the field of Information Technology.