Human beings have evolved different methods of communication over time. In earlier times, the messages were delivered by beating the drum or hollow tree trunks, giving indications through smoke or fire or with the help of fast runners. Horses, camels, dogs, birds and other animals were also used to send messages. Initially, the means of communication were also the means of transportation. The invention of the postoffice, telegraph, printing press, telephone, satellite, etc has made communication much faster and easier. Development in the field of science and technology has significantly contributed in bringing about a revolution in the field of communication.

Expand PSLV in reference to Indian Space Industry.

Polar Satellite Launch Vehicle

The IRS satellite system became operational with the launching of IRS-IA in March 1988 from Vaikanour in Russia. India has also developed her own Launching Vehicle PSLV (Polar Satellite Launch Vehicle).