Ramadan is the 9th month of the Islamic lunar calendar.
During the blessed month of Ramadan, Muslims all over the world abstain from food, drink, and other physical needs during the daylight hours. As a time to purify the soul, refocus attention on God, and practice self-sacrifice, Ramadan is much more than just not eating and drinking.
During Ramadan, every part of the body must be restrained. The tongue must be restrained from backbiting and gossip. The eyes must restrain themselves from looking at unlawful things. The hand must not touch or take anything that does not belong to it. The ears must refrain from listening to idle talk or obscene words. The feet must refrain from going to sinful places. In such a way, every part of the body observes the fast.
Therefore, fasting is not merely physical, but is rather the total commitment of the person's body and soul to the spirit of the fast. Ramadan is a time to practice self-restraint; a time to cleanse the body and soul from impurities and re-focus one's self on the worship of God.

For more info, please check the following sites:
http://en.wikipedia.org/wiki/Ramadan

http://islam.about.com/od/ramadan/f/ramadanintro.htm

http://www.tebyan.net/index.aspx?pid...YWORD=+ramadan