Karthika Purnima is a very special and auspicious day - the full moon of the month Karthika.

This full moon has a special significance for many different traditions, and is celebrated for many reasons... :)

Some of them being the following:

• It is considered the day that Vishnu or Narayana took avatara in the form of Matsya (the fish).
• It is considered the day that Shiva relieved the three worlds from the terror of Tripurasura (and it is thus considered as a day very dear to Shiva, after Shivaratri).
• It is called Deva Dipavali (the diwali of the Gods).
• Jains celebrate and worship Lord Mahavira on this day.
• It is considered the day Karthikeya took birth.
• It is also dedicated to the ancestors that have passed away (Pitris).
• Sikhs celebrate Guru Nanak's birthday.