Ramadan is the ninth month of the Islamic calendar, and is also known as the Holy Month - as this is when the Prophet Muhammed (PBUH) first had the Qu'ran revealed to him. During Ramadan, Muslims fast between dawn and sunset, and also undertake additional charity work and prayer. As the Islamic calendar and Gregorian calendar are not aligned, the dates of Ramadan change slightly by 11 days every year – currently Ramadan starts in March and ends in April.