Solution:All India Radio, officially known since 1956 as Akashvani, is the national public radio broadcaster of India. It is a division of Prasar Bharati. It was established in 1936. All India Radio is the largest radio network in the world, and one of the largest broadcasting organisations in the world in terms of the number of languages broadcast and the spectrum of socio-economic and cultural diversity it serves. It provides DTH (direct-broadcast satellite) service FM Rainbow and FM Gold as its subsidiary channels.