Happy Ramadan [year 1428]

Ramadhan (Ramadan) is the 9th month of the Islamic calendar.  It's when Muslims all over the world spend 30 days fasting and bettering themselves in principles of faith.
 
Muslims are also expected to put more effort into following the teachings of Islam by refraining from sexual intercourse (during fasting), violence, anger, envy, greed, lust, angry and sarcastic retorts, and gossip. People are meant to try to get along with each other better than they normally might. All obscene and irreligious sights and sounds are to be avoided. Purity of both thought and action is important. The fast is an exacting act of deep personal worship in which Muslims seek a raised level of closeness to God. The act of fasting is said to redirect the heart away from worldly activities, its purpose being to cleanse the inner soul and free it from harm.

Fasting during Ramadan is not obligatory for several groups for whom it would be excessively problematic. Children before the onset of puberty are not required to fast, though some do. However, if puberty is delayed, fasting becomes obligatory for males and females after a certain age. According to the Qur'an, if fasting would be dangerous to someone's health, such as a person with an illness or medical condition (this can include the elderly), that person is excused.

The reason Muslims fast is to discipline their body and mind.  The absence of food and drink and other pleasures provides a perfect opportunity to concentrate on prayer and worship.  Not having the luxuries of life to hand makes it easier to reflect on life and be grateful for what we do have.  Muslims use this month to start afresh and give their life a new direction.

Read more at wikipedia.
Here is an idiotic Q&A about Ramadhan.