How did Quit India movement start? What is its significance in India’s struggle for independence?

How did Quit India movement start? What is its significance in India’s struggle for independence? (GS 1)

भारत छोड़ो आंदोलन कैसे प्रारंभ हुआ? भारत के स्वतंत्रता संघर्ष में इसका महत्व क्या है?