(A) People use different modes of communication to convey the messages. T.V, Radio and Satellite communication are the part of mass communication. They play an important role in the mass communication. (B) It changed the socio-economic and cultural life of people as they get benefited:— (i) All India Radio broadcasts a variety of programmes related to information, education and entertainment. (ii) Special news bulletins are also broadcast at specific occasions like session of Parliament and State Legislatures. (iii) They are used for the purpose of advertisement of various products. They are used to create awareness on government policies and programmes. (iv) They are also used to create awareness about various diseases and their precautions. In this way they act as public health measures. (v) Weather forecasting information, important facts and figures reach to general public only through radio and TV