Maha Shiv Raatri is a celebration of Lord Shiva and Devi Parvati’s wedding. Devi Parvati performed intense tapasya for a long period of time in order to attain Lord Shiva in marriage. Though many attempted to discourage her from her path of devotion.
Fasting is a common Hindu RELIGIOUS practice. There are many TIMES each year that people fast, including Maha Shivratri. Fasting is the practice of not eating for half a day, a full day, or longer, and is to worship Gods in festivals.