The Second War of Carnatic was the most important war out of the three wars of Carnatic. This war was a symbol of the diplomatic victory of the English. Before this, the English were badly defeated by the French in the First War of Carnatic. As a result, the French power in India became very strong. In the Second War of Carnatic too, the English were on the verge of defeat.
But Robert Clive cleverly changed the situation. He turned the war plan of the French into a failure. After this war, the power of the French rapidly declined. Consequently, the English easily defeated the French in the Third War of Carnatic. Had the English been defeated in the Second War of Carnatic, they would have not only lost trade in India, but would have to leave India like the Portuguese and the Dutch.