DD National (DD1) is a state-owned general interest terrestrial television channel in India. It is the flagship channel of Doordarshan, the Indian public service broadcasting corporation, and the most widely available terrestrial television channel in India. It was founded on September 15, 1959. It is the largest terrestrial network in the world covering about 92% population and 81% land area of the country. Being a Public Service Broadcaster the channel continues to make significant contribution to accelerate socio-economic changes, promote national integration, inculcate a sense of unity and fraternity and stimulate scientific temperament among the people.