Now a days, telecommunications involves the use of electrical devices such as the telegraph, telephone and teleprinter, as well as the use of radio and microwave communications, as well as fiber optics and their associated electronics, plus the use of the orbiting satellites and the Internet.
A revolution in wireless telecommunication began in the year of 1900s with pioneering developments in wireless radio communication by the great scientist Nikola Tesla and Guglielmo Marconi. Mr. Marconi won the Nobel Prize in Physics in 1909 for his great efforts. Another highly notable pioneering inventors and developers in the field of electrical and electronic telecommunications include Charles Wheatstone and Samuel Morse (for telegraph), Alexander Graham Bell ( for telephone), Edwin Armstrong, and Lee de Forest (for radio), as well as John Logie Baird and Philo Farnsworth (for television).
The world's effective capacity to exchange information through two-way telecommunication networks grew up from 281petabytes of information in 1986, to 471 petabytes in 1993, to 2.2 exabytes in 2000, and to 65 exabytes in 2007. This is the informational equivalent of 2 newspaper pages per person per day in 1986, and 6 entire newspapers per person per day by 2007.[2] Given this growth, telecommunications play an increasingly important role in the world economy and the worldwide telecommunication industry's revenue was estimated to be $3.85 trillion in 2008.The service revenue of the global telecommunications industry was estimated to be $1.7 trillion in 2008, and is expected to touch $2.7 trillion by 2013.
