Kartika masam or Kartik month is the most auspicious month amongst all 12 Hindu months. As per the most popular belief, Lord Vishnu goes to sleep on Ashadha Ekadashi and wakes up on Kartika Shukla Ekadashi. It is believed that during Kartik month, Lord Shiva and Lord Vishnu come to visit Earth.
The pujas, all other rituals, rules and codes during the month are called as Kartika Masa Vratam. Many Hindu calendars have mentioned that Kartika masam Kartik is the holiest month in the Hindu lunar calendar. It usually overlaps with the months of October & November in the English calendar. Kartik Maas is described in the scriptures as the best months for performing austerities. Kartik deep daan dispels the delusion of dark and leads one to the path of light of the Divine one.
Kartik Deep Daan which is performed in Ganga River during this month of the year, you will be blessed by Lord Vishnu/Lord Shiva for health, prosperity and wealth forever. It is also believed that religious work done during this month provides results equivalent to visiting all the pilgrimages. It is also believed that praying to Lord Vishnu/Shiva during Kartik maas fetches the devotee Moksha (salvation).
This Pooja is performed by dedicating Lamps to Mata Ganga. In this Pooja, Mata Ganga is worshipped, Aarti is performed and then Lamps are offered in the river banks of the Ganges.