The name “Ramadan” is the name of the ninth month; the word itself derived from an Arabic word *rmd as in “ramida” or “ar-ramad” denoting intense heat, scorched ground, and shortness of rations. It is considered the most venerated and blessed month of the Islamic year. Prayers, sawm (fasting), charity, and self-accountability are especially stressed at this time; religious observances associated with Ramadan are kept throughout the month.
Laylat al-Qadr, which is thought most probable to occur during an odd night in the last 10 days of Ramadan, so it might be the 21, 23, 25, 27, or the 29 of Ramadan, is considered the most holy night of the year. It is the night in which the Quran was sent down to Muhammad. Ramadan ends with the holiday Eid ul-Fitr, on which feasts are held. During the month following Ramadan, called Shawwal, Muslims are encouraged to fast for a further six days (known as “El sitta el beyd” or “the white six”).
Reference : Wikipedia