Full moon days in Hindu calendar are known as Purnima or Pournami.
South Indian people called it as Pournami, where as North Indians called it as Purnima.
Apart from festivals, Pournami is a very important and auspicious day in Hindu calendar. Pournami that falls in the month of Ashwayujam or Ashwin is called as Ashwin Purnima or Ashwayuja Pournami.
In some parts of India, it is called as Kojagiri Purnima or Kuanr Purnima. It is also called as Sharad Purnima as the day marks the beginning of Sharad Rutu.
North Indian people celebrate Kojagari Lakshmi Puja, Kaumudi Puja, and Indra Puja on this day. In West Bengal, Lakshmi Puja is observed on this day.
In Orissa it is also called as Kumar Purnima and they celebrate Gaja Lakshmi Puja on this day. In Puri Jagannath Temple, Ashwayuja Pournami is one of the big festivals.