Doordarshan, India's National Broadcaster, has 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.
DD provides television, radio, online and mobile services throughout metropolitan and regional India, as well as overseas through the Indian Network and Radio India.
The service is available in terrestrial mode from 5.30 am till midnight. In the satellite mode, DD National is available round the clock. The telecast time of this composite public service channel is so devised that it caters to the needs of different viewers at different timings.
The information component on DD National consists of news and current affairs programmes largely produced in-house. The Question Hour in Parliament is telecast live on the DD National and DD News Channel.