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The national flag of Pakistan (Urdu: اسلامی جمہوریہ پاکستان کا پرچم ‎, flag of the Islamic Republic of Pakistan) was adopted in its present form during a meeting of the Constituent Assembly on 11 August 1947, just three days before the country's independence, when it became the official flag of the Dominion of Pakistan. It was afterwards retained by the current-day Islamic Republic of Pakistan. The flag is a green field with a white crescent moon and five-pointed star at its centre, and a vertical white stripe at the hoist side. Though the green colour is mandated only as 'dark green', its official and most consistent representation is Pakistan green, which is shaded distinctively darker. The flag is referred to in the national anthem as the Flag of the Crescent and Star. It is flown on several important days of the year including Republic Day, Independence Day and Defence Day. It is often hoisted every morning at schools, offices and government buildings to the sound of the national anthem and lowered again before sunset. A notable flag raising and lowering ceremony is carried out each day with great pomp and enthusiasm at the Wagah Border attended by hundreds of spectators. The leadership of the Muslim League adopted the flag of the Dominion of Pakistan on 11 August 1947. The government of Pakistan has pronounced rules about the flying of the flag. It is to be displayed at full mast on 23 March of each year, marking the adoption of the Lahore Resolution in 1940 and the Declaration of the Republic of Pakistan in 1956, and on 14 August in celebration of Independence Day, when Pakistan was carved out from British India as a home for Indian Muslims. The flag of Pakistan is also mentioned in Pakistan's own national anthem in the third verse reading "پرچم ستارہ و ہلال، رہبر ترقی و کمال." which translates to "Flag with the Star and Crescent, the leader of progress and ascent".

Source: Wikipedia