What was the Sepoy Mutiny and how did it ultimately end the rule of the british east india company?

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what was the raj and the Indian civil service and why were they created?What was the Sepoy Mutiny and how did it ultimately end the rule of the british east india company?
The Indian Rebellion of 1857 began as a mutiny of sepoys of the British East India Company's army on 10 May 1857, in the town of Meerut, and soon escalated into other mutinies and civilian rebellions largely in the upper Gangetic plain and central India, with the major hostilities confined to present-day Uttar Pradesh, Bihar, northern Madhya Pradesh, and the Delhi region. The rebellion posed a considerable threat to Company power in that region, and it was contained only with the fall of Gwalior on 20 June 1858