The holy month of Ramadan will begin on May 5 and ends on June 4. Ramadan is the ninth month of the Islamic calendar, which will be observed by Muslims worldwide as a month of fasting (sawm) to commemorate the first revelation of the Quran to Muhammad according to Islamic belief. This annual observance is regarded as one of the Five Pillars of Islam. Ahead of the commencement of Ramadan, people greet each other "Ramadan Mubarak" or "Ramzan Mubarak" that means to have a "blessed Ramadan" while "Ramadan Kareem" means have a "generous Ramadan". People send messages, greetings, wishes and messages online via WhatsApp, SMS, Facebook or another social media platform or messaging services to those staying far.