Sankashti Chaturthi is a Hindu festival dedicated to the worship of Lord Ganesha. It is observed on the fourth day of the Krishna Paksha (the dark lunar phase or the waning fortnight of the moon) of every lunar month of the Hindu calendar. The term "Sankashti" means deliverance or freedom from difficulties, and it is believed that Lord Ganesha can provide relief from all obstacles and troubles.

If this Chaturthi falls on a Tuesday, it is called Angaraki Sankashti Chaturthi, which is considered highly important among all Sankashti Chaturthi days. In North and Central India, this fast is observed on the fourth day of Krishna Paksha of Magha month of the Hindu calendar.

The festival is celebrated by fasting, performing puja, and reciting mantras dedicated to Lord Ganesha. It is believed that observing this fast can bring good luck, prosperity, and success in life. The festival is also associated with the story of Lord Ganesha and his victory over the demon named Gajamukhasura.