There are 8 types of fasting. They are as follows:

1. FARZE MUAIYYAN.
   Fasting for the whole month of Ramadan once a year.
2. FARZ GHAIR MUAIYYAN
   The duty upon one to keep QAZAA of a Fast missed in the month of Ramadan with or without a valid reason.
3. WAJIB MUAIYYAN
   To vow to keep a fast on a specific day or date for the sake of Allah, upon the fulfillment of some wish or desire (NAZR).
4. SUNNAT
   Those Fastings which Rasulullah (S.A.W.) kept and encouraged others to keep, e.g. fasting on the 9th and 10th of Muharram, the 9th of Zil Hijjah, etc.
5. MUSTAHAB
   All fasts besides Farz, Wajib and Sunnah are Mustahab, e.g., fasting on Mondays and Thursdays.
6. MAKROOH
   Fasting ONLY on the 9th or 10th of Muharram or fasting ONLY on Saturdays.
7. HARAAM
   It is Haraam to fast on FIVE days during the year. They are Eidul Fitr, Eidul Adha and three days after Eidul Adha.