Ganesha Chaturthi (Gaṇēśa Caturthī or Vināyaka Caviti) is the Hindu festival celebrated in honour of the god Ganesha, the elephant-headed, remover of obstacles and the god of beginnings and wisdom. The festival, also known as Vinayaka Chaturthi, is observed in the Hindu calendar month of Bhaadrapada, starting on the shukla chaturthi (fourth day of the waxing moon period). The date usually falls between August and September. The festival lasts for 10 days, ending on Anant Chaturdashi (fourteenth day of the waxing moon period).
The modern festival involves installing clay images of Ganesha in public pandals (temporary shrines), which are worshipped for ten days with different variety of herbal leaves, plants. These are immersed at the end of the festival in a body of water such as a lake, along with the Idol. After adding herbal and medicated plants and leaves(patri) in lakes, the water in the lake becomes purified. This was in practice because, in early days people used to drink lake water, and to protect people from infections and viral diseases especially in this season, this tradition was introduced. Some Hindus also install the clay images of Ganesha in their homes. It is believed that Ganesha bestows his presence on earth for all his devotees during this festival. The festival was celebrated as a public event since the days of Shivaji (1630–1680). While celebrated all over India, it is grandest and most elaborate of them especially in Maharastra, Karnataka and Telangana which lasts for 10 days, ending on the day Anant Chaturdashi. And in other parts of Western India and Southern India it is celebrated. Outside India, it is celebrated widely in Terai region of Nepal and by Hindus in the United States, Canada, Mauritius, Singapore, Indonesia, Malaysia, Thailand, Cambodia, Burma, Fiji, New Zealand, Trinidad & Tobago, and Guyana.[Courtesy-wikipedia]