Why is English an important legacy in British rule of India?

Ever since British people came to India, they wanted to have control over India. They were desperate to have more trading advantages by treating the Indians as labors. They made penetration into the villages by implementing English as a tool. It was imperative to the people to learn western impact by learning English, albeit traditional and regional languages existed. With the help of this, Britain planned to upgrade surface transport, shipping and train. This had improved the economy and profits in trade across globe. British became wealthier, and stronger enough to beat any country in the world. Indian learned English to survive and serve the British governance.