Pujo means "worship". It is a religious ritual that Hindus perform on a variety of occasions to pray or show respect to their chosen Gods or Goddesses. Pujo basically involves making offerings to a chosen deity  so as to seek their blessings. The offerings are made with an acknowledgement – “I dedicate to you O God, what is truly yours.” .The whole Pujo is thus an acknowledgement of one’s smallness and humility, i.e. performance of Pujo  removes ego, which is truly the only hurdle on the path to success.

The worship of Durga is done in the autumn (শরৎ Shôrot) and is considered as the largest Hindu festival of Bengal. Durga's Pujo is celebrated from the sixth to tenth day in the month of Ashwin (আশ্বিন Ashshin), which is the sixth month in the Bengali calendar. Occasionally however, due to shifts in the lunar cycle relative to the solar months, it may also be held in the following month, Kartika (কার্তিক Kartik). In the Gregorian calendar, these dates correspond to the months of September and October.

In the Krittibas Ramayana, Rama invokes the goddess Durga in his battle against Ravana. Although she was traditionally worshipped in the spring, due to contingencies of battle, Rama had to invoke her in the autumn akaal bodhan. Today it is this Rama's date for the pujo that has gained ascendancy, although the spring pujo, known as Basanti Puja, is also present in the Hindu almanac and is celebrated in various parts of Bengal. Since the season of the puja is (শরৎ Shôrot) autumn, it is also known as শরদিয়া Shôrodia.

The pujos are held over a ten-day period, which is traditionally viewed as the coming of the married daughter, Durga, to her father, Himalaya's home. It is the most important festival in Bengal, and Bengalis celebrate with new clothes and other gifts, which are worn on the evenings when the family goes out to see the 'pandals' (temporary structures set up to venerate the goddess). Although it is a Hindu festival, religion takes a backseat on these five days: Durga Pujo in Bengal is a carnival, where people from all backgrounds, regardless of their religious beliefs, participate and enjoy themselves to the hilt.

On the right navifation panel, you can find different links which goes from the Bengali belief for the Pujo to a small introduction of each day of the Pujo and some pictures as we in the Mukerjee family celebrate our Pujo.

 (Note part of text has been inspirations from various sources and are not completly mine. I would definitely like to give due respect for the contents.)