Final answer:
English is the 'subsidiary official language' of India, widely used in education, government, and daily conversations.
Step-by-step explanation:
English has been given the status of the 'subsidiary official language' of India. While Hindi is the official language of the government, English is widely used as a lingua franca in India, especially in secondary education and by the government and military.
It is also commonly used in signage, advertising, and conversation among educated people who switch between English and their native tongue.