Ramadan Mubarak is echoing through the Twitterverse. That's the traditional greeting today, the first day of Ramadan.
Muslims all over the world observe the ninth month of the Islamic calendar—the month, they believe, when the first verses of the Quran were revealed to the Prophet Muhammad.
The faithful are called to fast during daylight hours during Ramadan. Refraining from food and drink is intended to teach observers patience, spirituality, humility, and submissiveness to God and is considered one of the Pillars of Islam, the five duties incumbent on every Muslim.
In addition, Ramadan is a time for increased devotion, reading of the Quran, self-improvement, community involvement, charity, and good deeds.